A few friends of mine and I were playing on modern warefare 2 and happened into a hacked loby. The person who hacked us somehow got the first kill with a sniper rife from across the map on highrise. The second he did, the game ended with a loss for my team, and all my friends and I were kicked back down to level one. We all lost every rank and kill rank we had aquired over the months or years of playing. We reset our consoles, and were presented with a message saying we needed to reset all of our ranks and unlocks because we had an old version of the game. We're trying to get the problem resolved with xbox right now, however we don't know what is going on. The person who we believe did this hack, and got the kill in the match has a gamer tag of [Mod Removed]. I would reccomend that anyone who sees that tage IMIDIATELY back out of the lobby or you will have the same issue we are. If you happen to know how, I would suggest finding his gamer tag on xbox live and marking him as an avoided player BEFORE you encounter him. Good luck to anyone else who might happen across this problem as we have.