I have a similar problem, when a poser dialogue appears (e.g. delete figure prompt) poser hangs. Read somewhere this is a problem with flash. I tried updating flash but with no effect. Uninstalling flash gives you a super fast poser and no hanging problem but no library so no use. Only solution I have is to not to run other apps that are using flash. For example if I'm listening to an internet radio station via Chrome and poser hangs I can fix the problem by terminating chrome. Not tested other browsers, maybe they are ok.

MyCat - where did you get 8.0.3.11916 from ?