So I'm in Deshaan at Shad Astula (Cad Gold). The quest is called "Vision Quest" and I'm on the step "Investigate the Library".
As soon as I walk into the second room of the library the Malborn General Darvasen walks out delivering a line and then uses a spell on me. But I remain unaffected, and there is nothing for me to do in the objective area. If I reenter the room the General is re triggered and does it all over again.
I've already reloaded, relogged, abandoned the quest, and did each of those again without addons; but to no avail.