diff --git a/Subsurface/Source/Characters/AI/HumanAIController.cs b/Subsurface/Source/Characters/AI/HumanAIController.cs
index ef9cea153..fe14ee52d 100644
--- a/Subsurface/Source/Characters/AI/HumanAIController.cs
+++ b/Subsurface/Source/Characters/AI/HumanAIController.cs
@@ -39,7 +39,7 @@ namespace Barotrauma
 
             if (GameMain.GameSession!=null && GameMain.GameSession.CrewManager!=null)
             {
-                CurrentOrder = Order.PrefabList.Find(o => o.Name.ToLower() == "dismissed");
+                CurrentOrder = Order.PrefabList.Find(o => o.Name.ToLowerInvariant() == "dismissed");
                 objectiveManager.SetOrder(CurrentOrder, "");
                 GameMain.GameSession.CrewManager.SetCharacterOrder(Character, CurrentOrder);
             }
diff --git a/Subsurface/Source/Characters/AI/Objectives/AIObjectiveManager.cs b/Subsurface/Source/Characters/AI/Objectives/AIObjectiveManager.cs
index 04cb4c11b..1a6b91b45 100644
--- a/Subsurface/Source/Characters/AI/Objectives/AIObjectiveManager.cs
+++ b/Subsurface/Source/Characters/AI/Objectives/AIObjectiveManager.cs
@@ -71,7 +71,7 @@ namespace Barotrauma
 
             currentObjective = null;
 
-            switch (order.Name.ToLower())
+            switch (order.Name.ToLowerInvariant())
             {
                 case "follow":
                     currentObjective = new AIObjectiveGoTo(Character.Controlled, character, true);
diff --git a/Subsurface/Source/Characters/AI/Order.cs b/Subsurface/Source/Characters/AI/Order.cs
index be888bbb2..f8b9bab3f 100644
--- a/Subsurface/Source/Characters/AI/Order.cs
+++ b/Subsurface/Source/Characters/AI/Order.cs
@@ -39,7 +39,7 @@ namespace Barotrauma
 
             foreach (XElement orderElement in doc.Root.Elements())
             {
-                if (orderElement.Name.ToString().ToLower() != "order") continue;
+                if (orderElement.Name.ToString().ToLowerInvariant() != "order") continue;
 
                 PrefabList.Add(new Order(orderElement));
             }
@@ -100,7 +100,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in orderElement.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "sprite") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "sprite") continue;
                 SymbolSprite = new Sprite(subElement);
                 break;
             }
diff --git a/Subsurface/Source/Characters/Attack.cs b/Subsurface/Source/Characters/Attack.cs
index 5ed3af6b0..9d26273be 100644
--- a/Subsurface/Source/Characters/Attack.cs
+++ b/Subsurface/Source/Characters/Attack.cs
@@ -121,7 +121,8 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() == "particleemitter") particleEmitterPrefab = new ParticleEmitterPrefab(subElement);
+                if (subElement.Name.ToString().ToLowerInvariant() != "particleemitter") continue;
+                particleEmitterPrefab = new ParticleEmitterPrefab(subElement);
             }
         }
 
diff --git a/Subsurface/Source/Characters/BackgroundSprite/BackgroundCreaturePrefab.cs b/Subsurface/Source/Characters/BackgroundSprite/BackgroundCreaturePrefab.cs
index 6dd2dad53..b0e22914f 100644
--- a/Subsurface/Source/Characters/BackgroundSprite/BackgroundCreaturePrefab.cs
+++ b/Subsurface/Source/Characters/BackgroundSprite/BackgroundCreaturePrefab.cs
@@ -36,7 +36,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "sprite") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "sprite") continue;
 
                 Sprite = new Sprite(subElement);
                 break;
diff --git a/Subsurface/Source/Characters/BackgroundSprite/BackgroundSpritePrefab.cs b/Subsurface/Source/Characters/BackgroundSprite/BackgroundSpritePrefab.cs
index 8fe9c8021..c6c3b7ffd 100644
--- a/Subsurface/Source/Characters/BackgroundSprite/BackgroundSpritePrefab.cs
+++ b/Subsurface/Source/Characters/BackgroundSprite/BackgroundSpritePrefab.cs
@@ -37,7 +37,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "sprite") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "sprite") continue;
 
                 Sprite = new Sprite(subElement);
                 break;
diff --git a/Subsurface/Source/Characters/CharacterInfo.cs b/Subsurface/Source/Characters/CharacterInfo.cs
index cc13ef6d8..00d975eea 100644
--- a/Subsurface/Source/Characters/CharacterInfo.cs
+++ b/Subsurface/Source/Characters/CharacterInfo.cs
@@ -163,7 +163,7 @@ namespace Barotrauma
             XElement ragdollElement = doc.Root.Element("ragdoll");
             foreach (XElement limbElement in ragdollElement.Elements())
             {
-                if (ToolBox.GetAttributeString(limbElement, "type", "").ToLower() != "head") continue;
+                if (ToolBox.GetAttributeString(limbElement, "type", "").ToLowerInvariant() != "head") continue;
 
                 XElement spriteElement = limbElement.Element("sprite");
 
@@ -255,7 +255,7 @@ namespace Barotrauma
         {
             Name = ToolBox.GetAttributeString(element, "name", "unnamed");
 
-            string genderStr = ToolBox.GetAttributeString(element, "gender", "male").ToLower();
+            string genderStr = ToolBox.GetAttributeString(element, "gender", "male").ToLowerInvariant();
             gender = (genderStr == "m") ? Gender.Male : Gender.Female;
 
             File            = ToolBox.GetAttributeString(element, "file", "");
@@ -277,7 +277,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "job") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "job") continue;
 
                 Job = new Job(subElement);
                 break;
diff --git a/Subsurface/Source/Characters/Jobs/Job.cs b/Subsurface/Source/Characters/Jobs/Job.cs
index d15453aa0..d777bae65 100644
--- a/Subsurface/Source/Characters/Jobs/Job.cs
+++ b/Subsurface/Source/Characters/Jobs/Job.cs
@@ -54,13 +54,13 @@ namespace Barotrauma
 
         public Job(XElement element)
         {
-            string name = ToolBox.GetAttributeString(element, "name", "").ToLower();
-            prefab = JobPrefab.List.Find(jp => jp.Name.ToLower() == name);
+            string name = ToolBox.GetAttributeString(element, "name", "").ToLowerInvariant();
+            prefab = JobPrefab.List.Find(jp => jp.Name.ToLowerInvariant() == name);
 
             skills = new Dictionary<string, Skill>();
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "skill") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "skill") continue;
                 string skillName = ToolBox.GetAttributeString(subElement, "name", "");
                 if (string.IsNullOrEmpty(name)) continue;
                 skills.Add(
@@ -86,6 +86,8 @@ namespace Barotrauma
 
         public void GiveJobItems(Character character, WayPoint spawnPoint)
         {
+            if (SpawnItems == null) return;
+
             foreach (XElement itemElement in SpawnItems.Elements())
             {
                 InitializeJobItem(character, spawnPoint, itemElement);
diff --git a/Subsurface/Source/Characters/Jobs/JobPrefab.cs b/Subsurface/Source/Characters/Jobs/JobPrefab.cs
index 426a1e3b4..62fd6bbac 100644
--- a/Subsurface/Source/Characters/Jobs/JobPrefab.cs
+++ b/Subsurface/Source/Characters/Jobs/JobPrefab.cs
@@ -77,7 +77,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "items":
                         Items = subElement;
diff --git a/Subsurface/Source/Characters/Limb.cs b/Subsurface/Source/Characters/Limb.cs
index 37ec28622..3198bb8f6 100644
--- a/Subsurface/Source/Characters/Limb.cs
+++ b/Subsurface/Source/Characters/Limb.cs
@@ -265,7 +265,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "sprite":
                         string spritePath = subElement.Attribute("texture").Value;
diff --git a/Subsurface/Source/Characters/StatusEffect.cs b/Subsurface/Source/Characters/StatusEffect.cs
index 3da1ab535..273db9420 100644
--- a/Subsurface/Source/Characters/StatusEffect.cs
+++ b/Subsurface/Source/Characters/StatusEffect.cs
@@ -137,14 +137,14 @@ namespace Barotrauma
             int n = 0;
             foreach (XAttribute attribute in propertyAttributes)
             {
-                propertyNames[n] = attribute.Name.ToString().ToLower();
+                propertyNames[n] = attribute.Name.ToString().ToLowerInvariant();
                 propertyEffects[n] = ToolBox.GetAttributeObject(attribute);
                 n++;
             }
 
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "explosion":
                         explosion = new Explosion(subElement);
diff --git a/Subsurface/Source/DebugConsole.cs b/Subsurface/Source/DebugConsole.cs
index d5ce32bc7..7d8970caf 100644
--- a/Subsurface/Source/DebugConsole.cs
+++ b/Subsurface/Source/DebugConsole.cs
@@ -146,7 +146,7 @@ namespace Barotrauma
             if (command == "") return;
             string[] commands = command.Split(' ');
 
-            switch (commands[0].ToLower())
+            switch (commands[0].ToLowerInvariant())
             {
                 case "help":
                     NewMessage("menu: go to main menu", Color.Cyan);
@@ -203,7 +203,7 @@ namespace Barotrauma
 
                     if (commands.Length > 2)
                     {
-                        switch (commands[2].ToLower())
+                        switch (commands[2].ToLowerInvariant())
                         {
                             case "inside":
                                 spawnPoint = WayPoint.GetRandom(SpawnType.Human);
@@ -233,19 +233,19 @@ namespace Barotrauma
                                 }
                                 break;
                             default:
-                                spawnPoint = WayPoint.GetRandom(commands[1].ToLower()=="human" ? SpawnType.Human : SpawnType.Enemy);
+                                spawnPoint = WayPoint.GetRandom(commands[1].ToLowerInvariant()=="human" ? SpawnType.Human : SpawnType.Enemy);
                                 break;
                         }
 
                     }
                     else
                     {
-                        spawnPoint = WayPoint.GetRandom(commands[1].ToLower() == "human" ? SpawnType.Human : SpawnType.Enemy);
+                        spawnPoint = WayPoint.GetRandom(commands[1].ToLowerInvariant() == "human" ? SpawnType.Human : SpawnType.Enemy);
                     }
 
                     spawnPosition = spawnPoint == null ? Vector2.Zero : spawnPoint.WorldPosition;
 
-                    if (commands[1].ToLower()=="human")
+                    if (commands[1].ToLowerInvariant()=="human")
                     {
                         spawnedCharacter = Character.Create(Character.HumanConfigFile, spawnPosition);
                         Character.Controlled = spawnedCharacter;
@@ -315,8 +315,8 @@ namespace Barotrauma
                 case "controlcharacter":
                 case "control":
                     if (commands.Length < 2) break;
-                    commands[1] = commands[1].ToLower();
-                    Character.Controlled = Character.CharacterList.Find(c => !c.IsNetworkPlayer && c.Name.ToLower() == commands[1]);
+                    commands[1] = commands[1].ToLowerInvariant();
+                    Character.Controlled = Character.CharacterList.Find(c => !c.IsNetworkPlayer && c.Name.ToLowerInvariant() == commands[1]);
                     break;
                 case "godmode":
                     Submarine.Loaded.GodMode = !Submarine.Loaded.GodMode;
diff --git a/Subsurface/Source/Events/Missions/Mission.cs b/Subsurface/Source/Events/Missions/Mission.cs
index de10a9780..4f9d12ffb 100644
--- a/Subsurface/Source/Events/Missions/Mission.cs
+++ b/Subsurface/Source/Events/Missions/Mission.cs
@@ -9,7 +9,7 @@ namespace Barotrauma
 {
     class Mission
     {
-        private static List<Mission> list = new List<Mission>();
+        //private static List<Mission> list = new List<Mission>();
         
         private string name;
 
@@ -86,7 +86,7 @@ namespace Barotrauma
             headers = new List<string>();
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "message") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "message") continue;
                 headers.Add(ToolBox.GetAttributeString(subElement, "header", ""));
                 messages.Add(ToolBox.GetAttributeString(subElement, "text", ""));
             }
diff --git a/Subsurface/Source/GUI/ComponentStyle.cs b/Subsurface/Source/GUI/ComponentStyle.cs
index 4f6a73b1a..d336cb812 100644
--- a/Subsurface/Source/GUI/ComponentStyle.cs
+++ b/Subsurface/Source/GUI/ComponentStyle.cs
@@ -73,7 +73,7 @@ namespace Barotrauma
             
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "sprite":
                         Sprite sprite = new Sprite(subElement);
diff --git a/Subsurface/Source/GUI/GUIStyle.cs b/Subsurface/Source/GUI/GUIStyle.cs
index 1a9878454..bc810d82d 100644
--- a/Subsurface/Source/GUI/GUIStyle.cs
+++ b/Subsurface/Source/GUI/GUIStyle.cs
@@ -24,14 +24,14 @@ namespace Barotrauma
             foreach (XElement subElement in doc.Root.Elements())
             {
                 GUIComponentStyle componentStyle = new GUIComponentStyle(subElement);
-                componentStyles.Add(subElement.Name.ToString().ToLower(), componentStyle);
+                componentStyles.Add(subElement.Name.ToString().ToLowerInvariant(), componentStyle);
             }
         }
 
         public void Apply(GUIComponent targetComponent, GUIComponent parent = null)
         {
             GUIComponentStyle componentStyle = null;
-            string name = (parent==null) ? targetComponent.GetType().Name.ToLower() : parent.GetType().Name.ToLower();
+            string name = (parent == null) ? targetComponent.GetType().Name.ToLowerInvariant() : parent.GetType().Name.ToLowerInvariant();
             componentStyles.TryGetValue(name, out componentStyle);
 
             if (componentStyle==null)
diff --git a/Subsurface/Source/GameSession/CrewManager.cs b/Subsurface/Source/GameSession/CrewManager.cs
index 2c613449c..35261dd84 100644
--- a/Subsurface/Source/GameSession/CrewManager.cs
+++ b/Subsurface/Source/GameSession/CrewManager.cs
@@ -57,7 +57,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower()!="character") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "character") continue;
 
                 characterInfos.Add(new CharacterInfo(subElement));
             }
diff --git a/Subsurface/Source/GameSession/GameModes/SinglePlayerMode.cs b/Subsurface/Source/GameSession/GameModes/SinglePlayerMode.cs
index 0dec54830..3c57abf41 100644
--- a/Subsurface/Source/GameSession/GameModes/SinglePlayerMode.cs
+++ b/Subsurface/Source/GameSession/GameModes/SinglePlayerMode.cs
@@ -89,7 +89,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "crew") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "crew") continue;
                 
                 GameMain.GameSession.CrewManager = new CrewManager(subElement);                
             }
diff --git a/Subsurface/Source/GameSession/GameModes/Tutorials/TutorialType.cs b/Subsurface/Source/GameSession/GameModes/Tutorials/TutorialType.cs
index 76ce124a6..36af62a21 100644
--- a/Subsurface/Source/GameSession/GameModes/Tutorials/TutorialType.cs
+++ b/Subsurface/Source/GameSession/GameModes/Tutorials/TutorialType.cs
@@ -36,7 +36,7 @@ namespace Barotrauma.Tutorials
         public virtual void Initialize()
         {
 
-            GameMain.GameSession = new GameSession(Submarine.Loaded, "", GameModePreset.list.Find(gm => gm.Name.ToLower() == "tutorial"));
+            GameMain.GameSession = new GameSession(Submarine.Loaded, "", GameModePreset.list.Find(gm => gm.Name.ToLowerInvariant() == "tutorial"));
             (GameMain.GameSession.gameMode as TutorialMode).tutorialType = this;
 
             GameMain.GameSession.StartShift("tuto1");
@@ -58,7 +58,7 @@ namespace Barotrauma.Tutorials
 
             CharacterInfo charInfo = new CharacterInfo(Character.HumanConfigFile, "", Gender.None, JobPrefab.List.Find(jp => jp.Name == "Engineer"));
 
-            character = Character.Create(charInfo, wayPoint.WorldPosition);
+            character = Character.Create(charInfo, wayPoint.WorldPosition, false, false);
             Character.Controlled = character;
             character.GiveJobItems(null);
 
diff --git a/Subsurface/Source/GameSession/GameSession.cs b/Subsurface/Source/GameSession/GameSession.cs
index 8a8e40cef..8f0168bdb 100644
--- a/Subsurface/Source/GameSession/GameSession.cs
+++ b/Subsurface/Source/GameSession/GameSession.cs
@@ -96,7 +96,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in doc.Root.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "gamemode") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "gamemode") continue;
 
                 gameMode = new SinglePlayerMode(subElement);
             }
diff --git a/Subsurface/Source/GameSession/InfoTextManager.cs b/Subsurface/Source/GameSession/InfoTextManager.cs
index 38aceb7fb..3e28cfc0a 100644
--- a/Subsurface/Source/GameSession/InfoTextManager.cs
+++ b/Subsurface/Source/GameSession/InfoTextManager.cs
@@ -25,7 +25,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in doc.Root.Elements())
             {
-                string infoName = subElement.Name.ToString().ToLower();
+                string infoName = subElement.Name.ToString().ToLowerInvariant();
                 List<string> infoList = null;
                 if (!infoTexts.TryGetValue(infoName, out infoList))
                 {
@@ -40,7 +40,7 @@ namespace Barotrauma
         public static string GetInfoText(string infoName)
         {
             List<string> infoList = null;
-            if (!infoTexts.TryGetValue(infoName.ToLower(), out infoList) || !infoList.Any())
+            if (!infoTexts.TryGetValue(infoName.ToLowerInvariant(), out infoList) || !infoList.Any())
             {
 #if DEBUG
                 return "Info text ''" + infoName + "'' not found";
diff --git a/Subsurface/Source/GameSettings.cs b/Subsurface/Source/GameSettings.cs
index afd8776a4..6417e200e 100644
--- a/Subsurface/Source/GameSettings.cs
+++ b/Subsurface/Source/GameSettings.cs
@@ -171,7 +171,7 @@ namespace Barotrauma
             
             foreach (XElement subElement in doc.Root.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "contentpackage":
                         string path = ToolBox.GetAttributeString(subElement, "path", "");
diff --git a/Subsurface/Source/Items/Components/Door.cs b/Subsurface/Source/Items/Components/Door.cs
index 4c1dbffbb..e130dd930 100644
--- a/Subsurface/Source/Items/Components/Door.cs
+++ b/Subsurface/Source/Items/Components/Door.cs
@@ -127,7 +127,7 @@ namespace Barotrauma.Items.Components
            // isOpen = false;
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "sprite":
                         doorSprite = new Sprite(subElement, Path.GetDirectoryName(item.Prefab.ConfigFile));
diff --git a/Subsurface/Source/Items/Components/Holdable/MeleeWeapon.cs b/Subsurface/Source/Items/Components/Holdable/MeleeWeapon.cs
index d1ce2039e..bc56a8bb3 100644
--- a/Subsurface/Source/Items/Components/Holdable/MeleeWeapon.cs
+++ b/Subsurface/Source/Items/Components/Holdable/MeleeWeapon.cs
@@ -44,7 +44,7 @@ namespace Barotrauma.Items.Components
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "attack") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "attack") continue;
                 attack = new Attack(subElement);
             }
         }
diff --git a/Subsurface/Source/Items/Components/Holdable/Pickable.cs b/Subsurface/Source/Items/Components/Holdable/Pickable.cs
index 274fe8d92..f45ee1d9a 100644
--- a/Subsurface/Source/Items/Components/Holdable/Pickable.cs
+++ b/Subsurface/Source/Items/Components/Holdable/Pickable.cs
@@ -39,7 +39,7 @@ namespace Barotrauma.Items.Components
                 InvSlotType allowedSlot = InvSlotType.None;
                 foreach (string slot in slots)                
                 {
-                    if (slot.ToLower()=="bothhands")
+                    if (slot.ToLowerInvariant() == "bothhands")
                     {
                         allowedSlot = InvSlotType.LeftHand | InvSlotType.RightHand;
                     }
diff --git a/Subsurface/Source/Items/Components/Holdable/Propulsion.cs b/Subsurface/Source/Items/Components/Holdable/Propulsion.cs
index a19dba2ef..845ecdbf1 100644
--- a/Subsurface/Source/Items/Components/Holdable/Propulsion.cs
+++ b/Subsurface/Source/Items/Components/Holdable/Propulsion.cs
@@ -30,7 +30,7 @@ namespace Barotrauma.Items.Components
         public Propulsion(Item item, XElement element)
             : base(item,element)
         {
-            switch (ToolBox.GetAttributeString(element, "usablein", "air").ToLower())
+            switch (ToolBox.GetAttributeString(element, "usablein", "air").ToLowerInvariant())
             {
                 case "air":
                     usableIn = ParticlePrefab.DrawTargetType.Air;
diff --git a/Subsurface/Source/Items/Components/Holdable/RepairTool.cs b/Subsurface/Source/Items/Components/Holdable/RepairTool.cs
index 2402a3ff2..4dd1cc0c6 100644
--- a/Subsurface/Source/Items/Components/Holdable/RepairTool.cs
+++ b/Subsurface/Source/Items/Components/Holdable/RepairTool.cs
@@ -83,7 +83,7 @@ namespace Barotrauma.Items.Components
             fixableEntities = new List<string>();
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "fixable":
                         fixableEntities.Add(subElement.Attribute("name").Value);
diff --git a/Subsurface/Source/Items/Components/ItemComponent.cs b/Subsurface/Source/Items/Components/ItemComponent.cs
index fdf50d5bc..f9b3d110f 100644
--- a/Subsurface/Source/Items/Components/ItemComponent.cs
+++ b/Subsurface/Source/Items/Components/ItemComponent.cs
@@ -221,7 +221,7 @@ namespace Barotrauma.Items.Components
             
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "requireditem":
                     case "requireditems":
@@ -395,7 +395,7 @@ namespace Barotrauma.Items.Components
             if (sound.VolumeProperty == "") return 1.0f;
             
             ObjectProperty op = null;
-            if (properties.TryGetValue(sound.VolumeProperty.ToLower(), out op))
+            if (properties.TryGetValue(sound.VolumeProperty.ToLowerInvariant(), out op))
             {
                 float newVolume = 0.0f;
                 try
@@ -682,7 +682,7 @@ namespace Barotrauma.Items.Components
             foreach (XAttribute attribute in componentElement.Attributes())
             {
                 ObjectProperty property = null;
-                if (!properties.TryGetValue(attribute.Name.ToString().ToLower(), out property)) continue;
+                if (!properties.TryGetValue(attribute.Name.ToString().ToLowerInvariant(), out property)) continue;
                 
                 property.TrySetValue(attribute.Value);
             }
@@ -692,7 +692,7 @@ namespace Barotrauma.Items.Components
 
             foreach (XElement subElement in componentElement.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "requireditem":
                         RelatedItem newRequiredItem = RelatedItem.Load(subElement);
@@ -717,7 +717,7 @@ namespace Barotrauma.Items.Components
         public static ItemComponent Load(XElement element, Item item, string file, bool errorMessages = true)
         {
             Type t;
-            string type = element.Name.ToString().ToLower();
+            string type = element.Name.ToString().ToLowerInvariant();
             try
             {
                 // Get the type of a specified class.                
diff --git a/Subsurface/Source/Items/Components/ItemContainer.cs b/Subsurface/Source/Items/Components/ItemContainer.cs
index 2d7c0e402..be6ef25ed 100644
--- a/Subsurface/Source/Items/Components/ItemContainer.cs
+++ b/Subsurface/Source/Items/Components/ItemContainer.cs
@@ -101,7 +101,7 @@ namespace Barotrauma.Items.Components
             
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "containable":
                         RelatedItem containable = RelatedItem.Load(subElement);
diff --git a/Subsurface/Source/Items/Components/Machines/Deconstructor.cs b/Subsurface/Source/Items/Components/Machines/Deconstructor.cs
index 18784a4ca..2cbea0ad8 100644
--- a/Subsurface/Source/Items/Components/Machines/Deconstructor.cs
+++ b/Subsurface/Source/Items/Components/Machines/Deconstructor.cs
@@ -62,7 +62,7 @@ namespace Barotrauma.Items.Components
                 {
                     if (deconstructProduct.RequireFullCondition && targetItem.Condition < 100.0f) continue;
 
-                    var itemPrefab = ItemPrefab.list.FirstOrDefault(ip => ip.Name.ToLower() == deconstructProduct.ItemPrefabName.ToLower()) as ItemPrefab;
+                    var itemPrefab = ItemPrefab.list.FirstOrDefault(ip => ip.Name.ToLowerInvariant() == deconstructProduct.ItemPrefabName.ToLowerInvariant()) as ItemPrefab;
                     if (itemPrefab==null)
                     {
                         DebugConsole.ThrowError("Tried to deconstruct item ''"+targetItem.Name+"'' but couldn't find item prefab ''"+deconstructProduct+"''!");
diff --git a/Subsurface/Source/Items/Components/Machines/Fabricator.cs b/Subsurface/Source/Items/Components/Machines/Fabricator.cs
index 80e4b7b79..0af8ff80e 100644
--- a/Subsurface/Source/Items/Components/Machines/Fabricator.cs
+++ b/Subsurface/Source/Items/Components/Machines/Fabricator.cs
@@ -22,7 +22,7 @@ namespace Barotrauma.Items.Components
         {
             string name = ToolBox.GetAttributeString(element, "name", "");
 
-            TargetItem = ItemPrefab.list.Find(ip => ip.Name.ToLower() == name.ToLower()) as ItemPrefab;
+            TargetItem = ItemPrefab.list.Find(ip => ip.Name.ToLowerInvariant() == name.ToLowerInvariant()) as ItemPrefab;
             if (TargetItem == null)
             {
                 DebugConsole.ThrowError("Error in fabricable item "+name+"! Item ''" + element.Name + "'' not found.");
@@ -40,7 +40,7 @@ namespace Barotrauma.Items.Components
             {
                 if (string.IsNullOrWhiteSpace(requiredItemName)) continue;
 
-                ItemPrefab requiredItem = ItemPrefab.list.Find(ip => ip.Name.ToLower() == requiredItemName.Trim().ToLower()) as ItemPrefab;
+                ItemPrefab requiredItem = ItemPrefab.list.Find(ip => ip.Name.ToLowerInvariant() == requiredItemName.Trim().ToLowerInvariant()) as ItemPrefab;
                 if (requiredItem == null)
                 {
                     DebugConsole.ThrowError("Error in fabricable item " + name + "! Required item ''" + requiredItemName + "'' not found.");
@@ -64,7 +64,7 @@ namespace Barotrauma.Items.Components
 
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "requiredskill":
                         RequiredSkills.Add(new Skill(
diff --git a/Subsurface/Source/Items/Components/Machines/Radar.cs b/Subsurface/Source/Items/Components/Machines/Radar.cs
index 44ebb88a3..11179755e 100644
--- a/Subsurface/Source/Items/Components/Machines/Radar.cs
+++ b/Subsurface/Source/Items/Components/Machines/Radar.cs
@@ -42,7 +42,7 @@ namespace Barotrauma.Items.Components
 
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "pingcircle":
                         pingCircle = new Sprite(subElement);
diff --git a/Subsurface/Source/Items/Components/Machines/Reactor.cs b/Subsurface/Source/Items/Components/Machines/Reactor.cs
index fa835f642..cbe18715c 100644
--- a/Subsurface/Source/Items/Components/Machines/Reactor.cs
+++ b/Subsurface/Source/Items/Components/Machines/Reactor.cs
@@ -401,7 +401,7 @@ namespace Barotrauma.Items.Components
 
         public override bool AIOperate(float deltaTime, Character character, AIObjectiveOperateItem objective)
         {
-             switch (objective.Option.ToLower())
+            switch (objective.Option.ToLowerInvariant())
              {
                  case "power up":
                      float tempDiff = load - temperature;
diff --git a/Subsurface/Source/Items/Components/Power/PowerTransfer.cs b/Subsurface/Source/Items/Components/Power/PowerTransfer.cs
index abc917495..d4a8c5198 100644
--- a/Subsurface/Source/Items/Components/Power/PowerTransfer.cs
+++ b/Subsurface/Source/Items/Components/Power/PowerTransfer.cs
@@ -188,7 +188,7 @@ namespace Barotrauma.Items.Components
         {
             base.ReceiveSignal(stepsTaken, signal, connection, sender, power);
 
-            if (connection.Name.Length > 5 && connection.Name.Substring(0, 6).ToLower() == "signal")
+            if (connection.Name.Length > 5 && connection.Name.Substring(0, 6).ToLowerInvariant() == "signal")
             {
                 connection.SendSignal(stepsTaken, signal, sender, 0.0f);
             }
diff --git a/Subsurface/Source/Items/Components/Projectile.cs b/Subsurface/Source/Items/Components/Projectile.cs
index 874f6ddea..e82bfe08f 100644
--- a/Subsurface/Source/Items/Components/Projectile.cs
+++ b/Subsurface/Source/Items/Components/Projectile.cs
@@ -54,7 +54,7 @@ namespace Barotrauma.Items.Components
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "attack") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "attack") continue;
                 attack = new Attack(subElement);
             }
 
diff --git a/Subsurface/Source/Items/Components/Signal/Connection.cs b/Subsurface/Source/Items/Components/Signal/Connection.cs
index 0b8d6375e..37987afed 100644
--- a/Subsurface/Source/Items/Components/Signal/Connection.cs
+++ b/Subsurface/Source/Items/Components/Signal/Connection.cs
@@ -87,7 +87,7 @@ namespace Barotrauma.Items.Components
 
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "link":
                         int index = -1;
diff --git a/Subsurface/Source/Items/Components/Signal/LightComponent.cs b/Subsurface/Source/Items/Components/Signal/LightComponent.cs
index 390ac749c..57b9e5958 100644
--- a/Subsurface/Source/Items/Components/Signal/LightComponent.cs
+++ b/Subsurface/Source/Items/Components/Signal/LightComponent.cs
@@ -93,7 +93,7 @@ namespace Barotrauma.Items.Components
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "sprite") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "sprite") continue;
                 light.LightSprite = new Sprite(subElement);
                 light.LightSprite.Origin = light.LightSprite.size / 2.0f;
                 break;
diff --git a/Subsurface/Source/Items/Components/Turret.cs b/Subsurface/Source/Items/Components/Turret.cs
index f9a8bfdc0..f4d7925bd 100644
--- a/Subsurface/Source/Items/Components/Turret.cs
+++ b/Subsurface/Source/Items/Components/Turret.cs
@@ -187,7 +187,7 @@ namespace Barotrauma.Items.Components
         {
             var projectiles = GetLoadedProjectiles();
 
-            if (projectiles.Count==0 || (projectiles.Count==1 && objective.Option.ToLower()!="fire at will"))
+            if (projectiles.Count == 0 || (projectiles.Count == 1 && objective.Option.ToLowerInvariant() != "fire at will"))
             {
                 ItemContainer container = null;
                 foreach (MapEntity e in item.linkedTo)
@@ -272,7 +272,7 @@ namespace Barotrauma.Items.Components
             var pickedBody = Submarine.PickBody(ConvertUnits.ToSimUnits(item.WorldPosition), closestEnemy.SimPosition, null);
             if (pickedBody != null && !(pickedBody.UserData is Limb)) return false;
 
-            if (objective.Option.ToLower()=="fire at will") Use(deltaTime, character);
+            if (objective.Option.ToLowerInvariant() == "fire at will") Use(deltaTime, character);
 
 
             return false;
diff --git a/Subsurface/Source/Items/FixRequirement.cs b/Subsurface/Source/Items/FixRequirement.cs
index 37396ac48..e0884310a 100644
--- a/Subsurface/Source/Items/FixRequirement.cs
+++ b/Subsurface/Source/Items/FixRequirement.cs
@@ -29,7 +29,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "skill":
                         string skillName = ToolBox.GetAttributeString(subElement, "name", "");
diff --git a/Subsurface/Source/Items/Item.cs b/Subsurface/Source/Items/Item.cs
index 6deee76ae..10173e8da 100644
--- a/Subsurface/Source/Items/Item.cs
+++ b/Subsurface/Source/Items/Item.cs
@@ -343,7 +343,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "body":
                         body = new PhysicsBody(subElement, ConvertUnits.ToSimUnits(Position));
@@ -535,7 +535,7 @@ namespace Barotrauma
         {
             if (tag == null) return true;
 
-            return (tags.Contains(tag) || tags.Contains(tag.ToLower()));
+            return (tags.Contains(tag) || tags.Contains(tag.ToLowerInvariant()));
         }
 
 
diff --git a/Subsurface/Source/Items/ItemPrefab.cs b/Subsurface/Source/Items/ItemPrefab.cs
index 0327e798b..75738453e 100644
--- a/Subsurface/Source/Items/ItemPrefab.cs
+++ b/Subsurface/Source/Items/ItemPrefab.cs
@@ -184,7 +184,7 @@ namespace Barotrauma
                 XDocument doc = ToolBox.TryLoadXml(filePath);
                 if (doc == null) return;
 
-                if (doc.Root.Name.ToString().ToLower() == "item")
+                if (doc.Root.Name.ToString().ToLowerInvariant() == "item")
                 {
                     new ItemPrefab(doc.Root, filePath);
                 }
@@ -192,7 +192,7 @@ namespace Barotrauma
                 {
                     foreach (XElement element in doc.Root.Elements())
                     {
-                        if (element.Name.ToString().ToLower() != "item") continue;
+                        if (element.Name.ToString().ToLowerInvariant() != "item") continue;
 
                         new ItemPrefab(element, filePath);
                     }
@@ -253,7 +253,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                switch (subElement.Name.ToString().ToLower())
+                switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "sprite":
                         string spriteFolder = "";
diff --git a/Subsurface/Source/Items/RelatedItem.cs b/Subsurface/Source/Items/RelatedItem.cs
index 4d42d1f1d..a6cb62e39 100644
--- a/Subsurface/Source/Items/RelatedItem.cs
+++ b/Subsurface/Source/Items/RelatedItem.cs
@@ -148,7 +148,7 @@ namespace Barotrauma
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "statuseffect") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "statuseffect") continue;
 
                 ri.statusEffects.Add(StatusEffect.Load(subElement));
             }
diff --git a/Subsurface/Source/Map/Map/LocationType.cs b/Subsurface/Source/Map/Map/LocationType.cs
index 1d0e8bc3d..2fd6dc864 100644
--- a/Subsurface/Source/Map/Map/LocationType.cs
+++ b/Subsurface/Source/Map/Map/LocationType.cs
@@ -69,11 +69,11 @@ namespace Barotrauma
             hireableJobs = new List<Tuple<JobPrefab, float>>();
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "hireable") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "hireable") continue;
 
                 string jobName = ToolBox.GetAttributeString(subElement, "name", "");
 
-                JobPrefab jobPrefab = JobPrefab.List.Find(jp => jp.Name.ToLower() == jobName.ToLower());
+                JobPrefab jobPrefab = JobPrefab.List.Find(jp => jp.Name.ToLowerInvariant() == jobName.ToLowerInvariant());
                 if (jobPrefab==null)
                 {
                     DebugConsole.ThrowError("Invalid job name ("+jobName+") in location type "+name);
diff --git a/Subsurface/Source/Map/WayPoint.cs b/Subsurface/Source/Map/WayPoint.cs
index 48d89e3f7..492c7cb17 100644
--- a/Subsurface/Source/Map/WayPoint.cs
+++ b/Subsurface/Source/Map/WayPoint.cs
@@ -223,8 +223,8 @@ namespace Barotrauma
 
         private bool EnterAssignedJob(GUITextBox textBox, string text)
         {
-            string trimmedName = text.ToLower().Trim();
-            assignedJob = JobPrefab.List.Find(jp => jp.Name.ToLower() == trimmedName);
+            string trimmedName = text.ToLowerInvariant().Trim();
+            assignedJob = JobPrefab.List.Find(jp => jp.Name.ToLowerInvariant() == trimmedName);
 
             if (assignedJob !=null && trimmedName!="none")
             {
@@ -757,10 +757,10 @@ namespace Barotrauma
                 w.IdCardTags = idCardTagString.Split(',');
             }
 
-            string jobName = ToolBox.GetAttributeString(element, "job", "").ToLower();
+            string jobName = ToolBox.GetAttributeString(element, "job", "").ToLowerInvariant();
             if (!string.IsNullOrWhiteSpace(jobName))
             {
-                w.assignedJob = JobPrefab.List.Find(jp => jp.Name.ToLower() == jobName);
+                w.assignedJob = JobPrefab.List.Find(jp => jp.Name.ToLowerInvariant() == jobName);
             }
 
             w.ladderId = (ushort)ToolBox.GetAttributeInt(element, "ladders", 0);
diff --git a/Subsurface/Source/Networking/GameClient.cs b/Subsurface/Source/Networking/GameClient.cs
index 399257139..fdb32c0d1 100644
--- a/Subsurface/Source/Networking/GameClient.cs
+++ b/Subsurface/Source/Networking/GameClient.cs
@@ -975,7 +975,7 @@ namespace Barotrauma.Networking
             }
             else
             {
-                string command = ChatMessage.GetChatMessageCommand(message, out message).ToLower();
+                string command = ChatMessage.GetChatMessageCommand(message, out message).ToLowerInvariant();
                 
                 if (command=="r" || command=="radio" && CanUseRadio(Character.Controlled)) type = ChatMessageType.Radio;              
             }
diff --git a/Subsurface/Source/Networking/GameServer.cs b/Subsurface/Source/Networking/GameServer.cs
index 21e73a1a3..e53f56549 100644
--- a/Subsurface/Source/Networking/GameServer.cs
+++ b/Subsurface/Source/Networking/GameServer.cs
@@ -1144,10 +1144,10 @@ namespace Barotrauma.Networking
 
         public void KickPlayer(string playerName, bool ban = false)
         {
-            playerName = playerName.ToLower();
+            playerName = playerName.ToLowerInvariant();
 
-            Client client = ConnectedClients.Find( c => c.name.ToLower() == playerName ||
-                    (c.Character != null && c.Character.Name.ToLower() == playerName));
+            Client client = ConnectedClients.Find(c => c.name.ToLowerInvariant() == playerName ||
+                    (c.Character != null && c.Character.Name.ToLowerInvariant() == playerName));
 
             if (client == null) return;
 
@@ -1434,7 +1434,7 @@ namespace Barotrauma.Networking
 
             ChatMessageType type = gameStarted && myCharacter != null ? ChatMessageType.Default : ChatMessageType.Server;
 
-            string command = ChatMessage.GetChatMessageCommand(message, out message).ToLower();
+            string command = ChatMessage.GetChatMessageCommand(message, out message).ToLowerInvariant();
                 
             if (command=="dead" || command=="d")
             {
@@ -1447,8 +1447,8 @@ namespace Barotrauma.Networking
             else if (command != "")
             {
                 targetClient = ConnectedClients.Find(c =>
-                    command == c.name.ToLower() ||
-                    c.Character != null && command == c.Character.Name.ToLower());
+                    command == c.name.ToLowerInvariant() ||
+                    (c.Character != null && command == c.Character.Name.ToLowerInvariant()));
 
                 if (targetClient == null)
                 {
diff --git a/Subsurface/Source/Particles/ParticlePrefab.cs b/Subsurface/Source/Particles/ParticlePrefab.cs
index 8b1b1e540..54efa74fa 100644
--- a/Subsurface/Source/Particles/ParticlePrefab.cs
+++ b/Subsurface/Source/Particles/ParticlePrefab.cs
@@ -51,7 +51,7 @@ namespace Barotrauma.Particles
 
             foreach (XElement subElement in element.Elements())
             {
-                if (subElement.Name.ToString().ToLower() != "sprite") continue;
+                if (subElement.Name.ToString().ToLowerInvariant() != "sprite") continue;
 
                 Sprites.Add(new Sprite(subElement));
             }
@@ -140,7 +140,7 @@ namespace Barotrauma.Particles
 
             RotateToDirection = ToolBox.GetAttributeBool(element, "rotatetodirection", false);
 
-            switch (ToolBox.GetAttributeString(element, "drawtarget", "air").ToLower())
+            switch (ToolBox.GetAttributeString(element, "drawtarget", "air").ToLowerInvariant())
             {
                 case "air":
                 default:
diff --git a/Subsurface/Source/Properties.cs b/Subsurface/Source/Properties.cs
index 7453e99d6..f4d036ddb 100644
--- a/Subsurface/Source/Properties.cs
+++ b/Subsurface/Source/Properties.cs
@@ -82,7 +82,7 @@ namespace Barotrauma
             }
             else if (property.PropertyType == typeof(bool))
             {
-                propertyInfo.SetValue(obj, (value.ToLower() == "true"), null);                
+                propertyInfo.SetValue(obj, (value.ToLowerInvariant() == "true"), null);                
             }
             else if (property.PropertyType == typeof(int))
             {
@@ -201,7 +201,7 @@ namespace Barotrauma
 
             foreach (var property in properties)
             {
-                dictionary.Add(property.Name.ToLower(), new ObjectProperty(property, obj));
+                dictionary.Add(property.Name.ToLowerInvariant(), new ObjectProperty(property, obj));
             }
 
             return dictionary;
@@ -221,7 +221,7 @@ namespace Barotrauma
             foreach (var property in properties)
             {
                 ObjectProperty objProperty = new ObjectProperty(property, obj);
-                dictionary.Add(property.Name.ToLower(), objProperty);
+                dictionary.Add(property.Name.ToLowerInvariant(), objProperty);
 
                 //set the value of the property to the default value if there is one
                 foreach (var ini in property.Attributes.OfType<HasDefaultValue>())
@@ -238,7 +238,7 @@ namespace Barotrauma
                 foreach (XAttribute attribute in element.Attributes())
                 {
                     ObjectProperty property = null;
-                    if (!dictionary.TryGetValue(attribute.Name.ToString().ToLower(), out property)) continue;
+                    if (!dictionary.TryGetValue(attribute.Name.ToString().ToLowerInvariant(), out property)) continue;
                     if (!property.Attributes.OfType<HasDefaultValue>().Any()) continue;
                     property.TrySetValue(attribute.Value);
                 }            
@@ -279,7 +279,7 @@ namespace Barotrauma
                     stringValue = value.ToString();
                 }
 
-                element.Add(new XAttribute(property.Name.ToLower(), stringValue));
+                element.Add(new XAttribute(property.Name.ToLowerInvariant(), stringValue));
             }
         }
     }
diff --git a/Subsurface/Source/Screens/GameScreen.cs b/Subsurface/Source/Screens/GameScreen.cs
index 0dbbc797e..9540a0275 100644
--- a/Subsurface/Source/Screens/GameScreen.cs
+++ b/Subsurface/Source/Screens/GameScreen.cs
@@ -179,7 +179,7 @@ namespace Barotrauma
             GameMain.LightManager.ObstructVision = Character.Controlled != null && Character.Controlled.ObstructVision;
 
             GameMain.LightManager.UpdateLightMap(graphics, spriteBatch, cam);
-            if (Character.Controlled!=null)
+            if (Character.Controlled != null)
             {
                 GameMain.LightManager.UpdateObstructVision(graphics, spriteBatch, cam, Character.Controlled.CursorWorldPosition);
             }
@@ -194,7 +194,6 @@ namespace Barotrauma
             if (Level.Loaded == null)
             {
                 graphics.Clear(new Color(11, 18, 26, 255));
-
             }
             else
             {
diff --git a/Subsurface/Source/Screens/MainMenuScreen.cs b/Subsurface/Source/Screens/MainMenuScreen.cs
index 83b32f28e..250ab5554 100644
--- a/Subsurface/Source/Screens/MainMenuScreen.cs
+++ b/Subsurface/Source/Screens/MainMenuScreen.cs
@@ -385,7 +385,7 @@ namespace Barotrauma
             XElement modeElement = null;
             foreach (XElement element in doc.Root.Elements())
             {
-                if (element.Name.ToString().ToLower() != "gamemode") continue;
+                if (element.Name.ToString().ToLowerInvariant() != "gamemode") continue;
 
                 modeElement = element;
                 break;
diff --git a/Subsurface/Source/Screens/ServerListScreen.cs b/Subsurface/Source/Screens/ServerListScreen.cs
index 8b9d4cbb8..00d464ed9 100644
--- a/Subsurface/Source/Screens/ServerListScreen.cs
+++ b/Subsurface/Source/Screens/ServerListScreen.cs
@@ -142,7 +142,7 @@ namespace Barotrauma
                 return;
             }
 
-            if (masterServerData.Substring(0,5).ToLower()=="error")
+            if (masterServerData.Substring(0, 5).ToLowerInvariant() == "error")
             {
                 DebugConsole.ThrowError("Error while connecting to master server ("+masterServerData+")!");
 
diff --git a/Subsurface/Source/Sounds/SoundPlayer.cs b/Subsurface/Source/Sounds/SoundPlayer.cs
index cc0faa22f..11f9944cd 100644
--- a/Subsurface/Source/Sounds/SoundPlayer.cs
+++ b/Subsurface/Source/Sounds/SoundPlayer.cs
@@ -122,7 +122,7 @@ namespace Barotrauma
                 foreach (XElement element in xMusic)
                 {
                     string file = ToolBox.GetAttributeString(element, "file", "");
-                    string type = ToolBox.GetAttributeString(element, "type", "").ToLower();
+                    string type = ToolBox.GetAttributeString(element, "type", "").ToLowerInvariant();
                     Vector2 priority = ToolBox.GetAttributeVector2(element, "priorityrange", new Vector2(0.0f, 100.0f));
 
                     musicClips[i] = new BackgroundMusic(file, type, priority);
diff --git a/Subsurface/Source/Utils/ToolBox.cs b/Subsurface/Source/Utils/ToolBox.cs
index abc5f0487..17e8f8903 100644
--- a/Subsurface/Source/Utils/ToolBox.cs
+++ b/Subsurface/Source/Utils/ToolBox.cs
@@ -87,7 +87,7 @@ namespace Barotrauma
             }
             else
             {
-                string lowerTrimmedVal = value.ToLower().Trim();
+                string lowerTrimmedVal = value.ToLowerInvariant().Trim();
                 if (lowerTrimmedVal == "true")
                 {
                     return true;
@@ -186,7 +186,7 @@ namespace Barotrauma
         {
             if (attribute == null) return defaultValue;
 
-            string val = attribute.Value.ToLower().Trim();
+            string val = attribute.Value.ToLowerInvariant().Trim();
             if (val == "true")
             {
                 return true;