Recently, I was getting an error message on launch. I was told (by ThunderStone) to try the fix at this link and it worked like a charm. https://www.lostmarble.com/forum/viewtopic.php?f=2&t=29934

Also, if you purchased the upgrade to Poser Pro 11 you will need both the original serial number AND the upgrade serial number to launch the program. I hope this is helpful.