Dagon's right about the export dialog. It's a known and particularly bizarre bug that crops up. Switching to another application clears it up though on occasion, I've had to do it more than once if I recall correctly. If restarting Poser or rebooting doesn't fix the dials then indeed that indeed may be something more serious.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken