If it's really bad and deleting the Prefs didn't work, you could always do a full re-install.
Not as bad as it sounds, see below:

Cut your runtime from the application, put it somewhere else safe, uninstall Poser making sure you go into your drive and delete any files still there manually.
Do a clean re-install, then delete the runtime from your new install, then put your original one back in from wherever you put it.
This is do-able, I have done it previously with Poser 6 when I had a hard drive fry on me, it does work and will prolly sort out your problem if nothing else does..

Injustice will be avenged.
Cofiwch Dryweryn.