I have the same problem. I can't exit chapter one by the stairs or by blowing the forge. And switching to 640x480 does nothing. I had no problem the first time I played the game. My mistake was restarting to try finishing more of the quests in chapter one. My first game had no game stopping bugs up to where I restarted. Had to restart 3 times just to get to the end of chapter one since. Now I can't get any further. My only hope is the 1.42 patch I'm downloading now.
Oh, and I killed everyone the first time I finished chapter one and I got to chapter 2 no problem.
