I have heard that if you pull back to the wall area in front of the area in question the Gargoyle will finally spawn down on the ground like he is supposed to. When I have done this one, he sometimes spawns where he is supposed to, sometimes does not.
Enjoy the game, life is what you really want to be worried about.
PakKat "Everything was going well, until I died"
Gary Gravestink "I am glad you died, I needed the help"