Ron, Ron, Ron, ProPack does use the *.rsr files. Went you open a Library for the first time, ProPack search thru directory for the *.rsr and create the *.png for each and ProPack check each time you open a directory from the Library and will create new ones for any missing. So if you did a "search and destroy" on *.rsr and you have not used that Library directory you destroy the thumbnail image. Now on the Geometries Poser uses the *.rsr to load faster so the next time you load that *.obj file the *.rsr will be create. I hope you didnt empty the recycle bin now

The difference between stupidity and genius is that genius has its limits.