1.) Render to RSR! 4.) Export .pct for RSR Convertor, or just assimilate the program. With Pro Pak and Poser 5 you can export PNG. Which is what both Progs use for Thumbs. Just export a 91x91 pixel rendering straight to your library. After you export the image you will still need to reselect that library for the thumb to update. Just click for the directory, then click back off.