User blog:Mayjod/Game info lost

I hadn't played Assassin's Creed 2 in about a week. When I started up the game there was the usual mandatory update from X box. After I installed the update my saved game data is gone. Its letting me select continue game, but it starts me at the very begining of the game. My achievement points are still saved but I still have to start from the begining. Has this happenned to anyone else ?