Have came across the annoying glitch at the Jefferson Memorial rotunda were, after you see the 'Dad' die, Dr Li says follow her through tunnels but it keeps crashing everytime I try to leave the rotunda. Goes to between rooms loading screen and never recovers. Please help me, I can't be arsed to go through the whole game again, there must be away!!!!!!!!!

First, this is heavily spoiler-laden. Second, reload a save. You DO have a previous save right?

Use [spoiler] [ /spoiler] next time.
ass.

Yeah have saves. Should I go back to Tranquility Lane and go from there?

You don't have to go back that far. I was thinking if you had a save closer to just opening the door to the memorial. The outside door that is.

Gone back to Tranquility now. See what happens!

Played through from Tranquility and this time was ok. Reached the Brotherhood!