I finished the main quests, and I've finished all main Broken Steel quests. I am currently on Protecting the Water Way, in which I have to go speak with Officer Lepelletier at Rivet City. My save game is at the Jefferson Memorial, but every time I try to fast travel from there to anywhere else the game freezes. If I try to leave the area, the game also freezes, about at the point that I reach halfway across the bridge. I have tried this several times, with the same result, usually at the same point. Could anyone help me figure this out?