yes your right it is an annoying bug especially as im making a fully mulitplayer game, to make it work you have to change the background outside of FPSC. To do this dnt change your game settings then when you have comiled, copy your image into you games folder then open you games Files\languagebank\english\gamebank\arenagame folder then open the arenapage.fpi script you will see the background file name is called four times in the file change the file name to the background name you copied into your games folder for all four times and it will work without affecting any other aspect
Thanks
Adam