There is a potential problem here because Poser Pro Pak and Poser 5 don't use "bum" file extensions for bump maps. They use jpg bump maps. I'd run into some confusion in the past because of this difference. I decided to install most of my Poser resources in a runtime folder called "Poser5B." I have installed very little into the Poser 5 folder itself. I don't access the Poser 4 runtime folder from Poser 5 at all. I think some folks have problems because too many Poser resources have incorrect texture references. CorrectReference fixes that problem.