The "speak to whatshisface" quest sitting in my log from the Revanite chain on Drommund Kass. I finished the chain, got the title, but this step stays in my log, unable to be abandoned.
I can even reset and re-run the whole chain up to this point all over again, there it hangs. And so far multiple tickets have only yielded a "Sorry bro, can't help you" canned response.