I have Poser Pro 2010 running on Win 7 64. I love Pro and the new library but it does have issues. The libraries window can't be docked so you need to constantly swap between windows, and (a big issue for me) when you add to the library while Poser is open, the new additions don't appear in the library. You need to close and re-open Poser to have the new items appear. Even changing runtimes doesn't help. A refresh button would be nice.