Had a problem and was wondering if it had happened to anyone else.
I was going to play a game of zombies online and then I decided to log in on another controller so my brother could play too. The lobby for the zombies was at the front of the screen but behind it (because it is slightly transparent) it had the options menu up so I worked my way through that. It then came up with with the main menu where you are sitting in the chair (still behind the zombies screen). Later when I went to play zombies again I had lost Five and the BO Arcade modes. I went onto campaign and had lost all my data from there too.
Has this happened to anyone else?