I was playing Black ops,like 1 month ago(i hoped it would fix it self....). I played a few games, then I decided to modify my class a little bit, when I went out of the server, on the Multiplayer main menu, it said connecting... When it stopped, I was going to change my class, when the Create a class, Contracts and Killstreaks were unavailable... I went to my Playercard, and the menu was all locked, like the first time You play the game and your level 1, which i was.
My rank came back the next day, well to level 45 but that doesn't matter.