Since we all know that the Custom Games Area is Broken. So here is a way to edit your Custom Game Modes that works.
Ok after you have edited your “FIRST” game mode. Then you decide you want to make a change in that game mode. But as we all know you can’t make changes because the custom games area is broken and won’t save your edited game mode.
NOTE: Goto server and select OFFLINE!
- Make a copy of your orig. game mode you edited.
- Then make your changes to the “COPY” version of your game mode.
- Then save the new version of your Custom Game mode.
- Play game. Your new settings will be saved in your copy version of your custom game mode.
Side Note: You may have to shut down the game and restart the game.
Works for me!
Peace! 
