Forum:PS3 bug?

May i reset Playthrought2 and start from begining?

Because i have problem, i mean bug .) I start Playthrought 2, and when i first time meet T.K.Baha, i open the door and now, i have 2 T.K.Baha in the game. One in the chair, and another inside the house .) I play on PS3 and online, maybe one player jump from the rock in the balcony and in the same time i open the door. But, situation is bad, because i dont have any another quest. Game dont have any progress, i freezy now...