I've been having this issue for a game of mine for the last three days. I get through the hunt, mingle with the nobles, do the stealth mission (and the direct approach to see if it would make a difference), and solve the first vault puzzle. The problem is that I'll solve it but the final gates to advance won't open.
I've tried reloading and that doesn't work. I've tried restarting the entire DLC and that doesn't work. I even deleted the entire DLC file and reinstalled it, and I'm still having this problem. The thing is is that it's worked fine in the past, but it's just now that it's acting up.
I didn't do Legacy before doing Mark of the Assassin, and I don't bring Sebastian with me. I honestly don't know what could be causing this problem, and it virtually never happens from what I've looked up and seen from the forums.
Any ideas would be most helpful.
