OK, I ran into this same problem today. There actually was a Guide at the scene, and although he could not fix the problem himself, he said that the developers were aware of the problem, and were on top of it. He said that the npc was stuck in the floor, and since we cannot cast detrimental spells in PoT, he could not be pulled out by mortal means, heh. However, a short time later, I had a display glitch, where everything went red, and cubist looking. I logged off, shut down my comp and rebotted, then relogged. When I returned to PoT, the npc was still glitched. I was tracking him, when all of a suden, there he appeared right in front of the box where he is supposed to be, except he seemed to be pacing back and forth. (I have noticed wyverns in CS also doing the same thing, when they have usually been static spawns) I was able to do my turn in, but several other players there at the same time said that they could not see him. They were able to target him either through /target <npc name> or by assisting me as I had him targeted. I told one of the others that I had just relogged in, and he tried that too, but it didn't work for him. I know this is no help, but just wanted to tell you that the developers apparently are aware of this problem. Good luck, and I hope they get this fixed before I get my next ornate pattern.