Lost all my Data from a save. Paid for and downloaded CC on my own Xbox 360, played a few levels. Then played over at my friends house a few days later. After getting my Xbox 360 back from Microsoft (Red rings), I don't have any of the save information. Lost a ton of stuff, levels, characters etc. (Note, I save my profile on a memory card for easy transport from Xbox to Xbox, but this should not effect save information like this) Played just now on my 360 in a single player game, got to level 5. Quit out of CC and loaded it back up to see if it would save. I lost the Gray Knight (first level) unlock and my Blue Knight was level 1 again. Did not save. With all due respect, apparently there's alot of save issues. Hopefully this will be addressed in the next patch.