I entered the graveyard to finish chapter 3, and while in the lower tombs I took some stairs that I was unaware took me back to the surface. Mazzy took this moment to start up her side-quest. I'd quicksaved at the wrong time and when loaded again I was outside and Mazzy still started the question, but now I couldn't interact with any doors in the graveyard. My previous save was from a few hours before so therefore effectively worthless.
There might be spoilers below.
1) Can't enter buildings in graveyard
2) Graveyard is abandoned and no NPC's are there.
3) Can leave graveyard, complete other quests, and enter any other building.
Steps I've taken to try and mitigate:
1) Disabled hardware acceleration on my mouse
2) Started a new game, saved, then reloaded the glitched one
3) Restarted game
4) Entered other areas, saved, and reloaded
5) Consoled my party to the lower tombs, but this apparently screwed up quest progression and Bodhi started babbling about elves and such. Also all explored areas on the local map were gone, and vampires that should have been staked were no longer.
6) Removed everyone from my party then returned to the graveyard
Any help would be greatly appreciated.