Ensure our array handling only accepts single dimensional arrays.

OpenRA.Game/FieldLoader.cs

@@ -417,7 +417,7 @@ namespace OpenRA
 			}
 			else if (fieldType == typeof(bool))
 				return ParseYesNo(value, fieldType, fieldName);
-			else if (fieldType.IsArray)
+			else if (fieldType.IsArray && fieldType.GetArrayRank() == 1)
 			{
 				if (value == null)
 					return Array.CreateInstance(fieldType.GetElementType(), 0);

OpenRA.Game/FieldSaver.cs

@@ -89,7 +89,7 @@ namespace OpenRA
 				return "{0},{1},{2},{3}".F(r.X, r.Y, r.Width, r.Height);
 			}
 
-			if (t.IsArray)
+			if (t.IsArray && t.GetArrayRank() == 1)
 			{
 				var elems = ((Array)v).OfType<object>();
 				return elems.JoinWith(", ");