Turnkey97a, when Poser 4 opens an *.obj file for the first time it creates an *.rsr file in the same folder as the obj. Corruption of this *.rsr file is a common cause of the problem you discribe. Make a backup copy of the rsr file then delete the rsr. Next time you open the pp2 Poser 4 will rebuild the rsr. The rsr will be in one of the geomGeometries subfolders, don't delete any rsr from the library folders, these supply thumbnals for the pallets and will not be rebuilt.