You should be able to open your pz3 files from anywhere you like . Its possible that the polycount of the mountain freezes your Poser. But in case of the pp2 . Just put the prop anywhere you want in your prop library . I did not make a RSR when I propped it in ProPack - so if you are running Poser 4 you only have the shrugging guy. Also if you are on MAC you have to run it through MAC Converter first. But if you have the pp2 you also have the obj of the building. Try to import it into Poser - File - import - Wavefront Obj ( check reverse normals and 1000% Standard figure size for managable size in Poser ) - if this fails to function the 30.000 faces may be to much for your system . hope this helps a little bit