I just went back and did a quick work up of background and two terrains and imported the two Daz figures. It saves and loads okay so it's not the imported .obj files. the rest is pure Bryce after that. Is there a finite limit to number of polygons Bryce can load. It seems a dumb question since apparently I have memory enough to build and manipulate the scene initially. ???????????????? Hard disk sector problems????????? How do it check for bad sectors with out trashing all data?