Did you upgrade your OS or do a new install? Either way, you might try re-installing Poser. What I did last time so I wouldn't lose anything, was to rename my current poser folder (say to PoserOLD). Then install clean to Poser 4. After the install, I copied all of PoserOLD over to Poser 4. voila, I had my old Poser back. And because you've still got the old one, if something does go wrong, you can always get rid of the new Poser 4 and rename PoserOLD back to what it was. Then you're at least no worse for wear