Early days, but I recently had cause to delete Flash Player 15. Reinstalled it (version 16), but Poser didn't recognise it, so had to do it again from the Poser interface. I also am now using a new keyboard and mouse (nothing fancy). For whatever reason, Poser is now faster, and I haven't had a crash for days, nor have I lost the thumbnails. As a test, delete Flash Player, run CCleaner on your registry, reinstall Flash Player through the Poser interface, and just see. Relatively minor operation, and free, and may just help. In any case, a workaround needs to be tested on multiple systems.