I seriously love Bethesda, but their stuff is fucked sometimes.
I just downloaded the Pitt on Fallout 3, and am having a few issues with it. Not major, but still. Figured they would've polished it a bit more.
But I'm with Assman's advice, Krispy. Loading an old save always worked for me...and I know you said you deleted old ones, but I hope you can find an old one still.