I've had the same thing now for a couple of weeks and haven't installed anything other than the same characters(V3,M3,A3,H3 and Freak),materials,Hair(mostly Koz's hair)and Props that I've had on Poser 5. I have altered the Poser shell to remove the content paradise room. I can get the error loading different characters or even different props,so I don't think it can be narrowed down to just one problem file.