in shadowfen delve Gandranen Ruins there is a quest given by NPC called Zahra, on the last part of the quest "Riches Beyond Measures": talk to Zahra
Zahra will be invisible( cannot interact with or see) current fix is relogging to game.
Still true 23/04/17. Annoying waste of time. Had to go round the delve 3 times . I took the relogging advice after the second failure but I was loaded outside the delve ((