The .rsr's that are in the same folder as the cr2-files are the preview pictures used for P4. Deleting those won't help. It's the .rsr that is in the same folder as the obj-file (somewhere in the Geometries folder) that could get corrupt, so that's the one you should try deleting (but not the obj-file itself). Poser will rebuild the .rsr when you load the figure next time. This is true for Poser 4, I don't know about PPP.