I made an account just to post here and say that it also happened to me. Except it happened to me when I fired up NBA 2K12. Same message and everything popped up. I was editing MyPlayer and I got the achievement saying "My Big Eight-O" and I know I already had it because I've been at 99 overall for a long time now.
Now I only have 20 gamerscore when I did have... 32,493.
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