another "The Man Who Waits" progression-blocking bug: just won't finish?

I did the Uscgrim fight, cleared out all the flesh golems and wichts. If I talk to Azo, I just say, "I don't have time for this" and leave-- there are no other dialog options. If I talk to him again, it's the old dialog options.

I talk to Mr. Statue, I get the end-of-quest dialog. We talk about Azo's experiments and whatnot and everything seems done.

But the whole quest log is just grey, and it won't finish. It stays active, but I have no active tasks in it, I get no XP, it just hangs out in my log.

Any known workarounds?