I saw this after almost breaking down because of the bug. I had the same bug during my first playthrough, where I thought it was because I triggered an event that barred me from continuing the quest. Funny story: The point where you [spoilerS!] kill Menge and burn down the Witchhunter's HQ. I couldn't see the exit (where you have to blast through a wall) so I jumped over the wall. Bugged it out completely and I was so confused, spent a good half hour trying to get it right.