12-23-2010 12:20 PM
I'm not quite sure why but I know it's happening to quite a few people. You're stats aren't actually gone. There just not showing, and in turn you aren't given any specializations and as far as I know, the knife kills (tags) and kills don't count. Though I have noticed peoples stats show back up after playing for awhile. Mine came back yesterday, but there gone again this morning.