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I'm not into spoilers, so going to be brief. I've submitted tickets, posted on the official forums and found nothing that worked to fix this ongoing problem. Apparently, once you reach the final mission for Act 1, you're suppose to kill a final boss. Well, unfortunately for a lot of BH's, that final boss refuses to spawn, despite mission resets, loggin out and back in and even leaving the mission and coming back.
Both my wife and I are in the same boat with this. She tried doing her BH first and got the bug, nothing worked. I tried with my BH and same thing, no fix. Hopefully this mornings patch fixes it cause a broken class quest is kind of a big no no.