When I was fighting the Living Seige Engine at the Edge of the Abyss, I got stuck 3/4 of the way through and couldn't hit the npc....eventually my "crew" finished it off. I was still stuck and couldn't pick up my loot. Couple rares dropped too. I logged out and came back. I was no longer stuck but all the loot was gone. I was stuck at the left side of the entrance.