Index: ps/trunk/binaries/data/mods/public/gui/gamesetup/Pages/AIConfigPage/Controls/AIBehavior.js
===================================================================
--- ps/trunk/binaries/data/mods/public/gui/gamesetup/Pages/AIConfigPage/Controls/AIBehavior.js
+++ ps/trunk/binaries/data/mods/public/gui/gamesetup/Pages/AIConfigPage/Controls/AIBehavior.js
@@ -28,7 +28,7 @@
 				mapPData && mapPData.AI ?
 					(mapPData.AIBehavior !== undefined ?
 						mapPData.AIBehavior :
-						g_Settings.PlayerDefaults[this.playerIndex + 1].AIBehavior) :
+						g_Settings.PlayerDefaults[playerIndex + 1].AIBehavior) :
 					undefined;
 		}
 	}
@@ -41,7 +41,9 @@
 
 		if (pData.AI)
 		{
-			if (this.fixedAIBehavior[playerIndex] && pData.AIBehavior !== this.fixedAIBehavior[playerIndex])
+			if (this.fixedAIBehavior[playerIndex] &&
+				(pData.AIBehavior === undefined ||
+				pData.AIBehavior !== this.fixedAIBehavior[playerIndex]))
 			{
 				pData.AIBehavior = this.fixedAIBehavior[playerIndex];
 				this.gameSettingsControl.updateGameAttributes();
Index: ps/trunk/binaries/data/mods/public/gui/gamesetup/Pages/AIConfigPage/Controls/AIDifficulty.js
===================================================================
--- ps/trunk/binaries/data/mods/public/gui/gamesetup/Pages/AIConfigPage/Controls/AIDifficulty.js
+++ ps/trunk/binaries/data/mods/public/gui/gamesetup/Pages/AIConfigPage/Controls/AIDifficulty.js
@@ -28,7 +28,7 @@
 				mapPData && mapPData.AI ?
 					(mapPData.AIDiff !== undefined ?
 						mapPData.AIDiff :
-						g_Settings.PlayerDefaults[this.playerIndex + 1].AIDiff) :
+						g_Settings.PlayerDefaults[playerIndex + 1].AIDiff) :
 					undefined;
 		}
 	}
@@ -41,7 +41,9 @@
 
 		if (pData.AI)
 		{
-			if (this.fixedAIDiff[playerIndex] !== undefined && pData.AIDiff !== this.fixedAIDiff[playerIndex])
+			if (this.fixedAIDiff[playerIndex] !== undefined &&
+				(pData.AIDiff === undefined ||
+				pData.AIDiff !== this.fixedAIDiff[playerIndex]))
 			{
 				pData.AIDiff = this.fixedAIDiff[playerIndex];
 				this.gameSettingsControl.updateGameAttributes();
Index: ps/trunk/binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/GameSettings/PerPlayer/Dropdowns/PlayerAssignment.js
===================================================================
--- ps/trunk/binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/GameSettings/PerPlayer/Dropdowns/PlayerAssignment.js
+++ ps/trunk/binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/GameSettings/PerPlayer/Dropdowns/PlayerAssignment.js
@@ -93,7 +93,7 @@
 		if (!pData)
 			return;
 
-		if (this.fixedAI && pData.AI != this.fixedAI)
+		if (this.fixedAI && (pData.AI === undefined || pData.AI != this.fixedAI))
 		{
 			pData.AI = this.fixedAI;
 			this.gameSettingsControl.updateGameAttributes();