In following this forum post
One of my characters, Agarno, accidentally completed the Wild Captain quest first with the NPC. Now the quest is showing as ready to turn in AND there is a ring for it on the minimap. However, the NPC does not react and the quest is no longer completable.
Any ideas or is it just better to cancel?
I did try the shift-F10 u and I can get to the NPC, just unable to turn it in.