I am having a similar problem, just two users have trouble loading my latest character because it's looking for bump maps. My understanding was that Poser 5 should create them from the .jpg maps provided. One user said they followed the directions and created the .bum before loading and it still hung up. It was suggested by one of them that the bump node should be plugged into "bump" instead of "gradient bump" where it defaults to from Poser 4. Is that correct? I have Poser 5 and they load fine for me so I can't test the problem either.

"Your work is to keep cranking the flywheel that turns the gears that spin the belt in the engine of belief that keeps you and your desk in midair."

Annie Dillard