You better believe it's the file I downloaded today and NOT my computer. I did a test of the Props and first re downloaded the files to get a second copy. Then reinstalled them. Then I decide to save the two parented props as seperate props and Lo and Behold......the Street prop works but the Stairs prop is bad. The only way we will know for sure is if someone takes my bad stairs prop and tries it out. I need a new file "Fresh" and Not from the server that the current one is on and re test it. I can tell you this after doing this test....It's the Prop file that is BAD. Not my computer or Poser 5. See the attached pics for Proof.