Having the EXACT same problem, except I will occasionally get to forge on maps/play on maps that I would normally not be able to play on... Just to make matters worse, a purple screen will pop up during the sponsors, and will then say the disc is unreadable... The worst part is I'm not even sure I 343 can fix this bug. I'm not sure if I can't play because I have a flàsh drive, or because I have the original Xbox. Damn, this is SO frustrating!