Xbox 360 here.
It has done this to me about 4 times now. Every time I am changing a class and the game starts while I'm in CaC, my game freezes. It doesn't fix itself, so I'm forced to restart my whole Xbox. It has only done this after the update. I'm curious if this has happened to anyone else yet.
It froze one other time too, but that was when I was trying to load my combat record and I wasn't even in a lobby at the time.