Did you by chance change your screen resolution with Poser running? I made the mistake of doing that once and Poser freaked out giving me similar problems to what you describe. I fixed it by returning the resolution to what it was before (with Poser not running), launching Poser and setting it to use the default start up settings, reboot, reset my resolution to what I wanted, then another reboot again. When I started Poser this time the default windows and cameras behaved normally again and I reset my preferred state for the current screen resolution. Even if you didn't reset your screen resolution, you could still try setting Poser to use the default settings and rebooting to see if it helps. Otherwise, I have no idea :(