I asked about the IE9 beta browser because it breaks some of the windows in Fusion.
Fusion uses the IE engine internally and doesn't care for the new one. It's fine through IE8.
I've never seen the problem you're having, except when you're not running as administrator or when you have your User Sites folder inside the Fusion program folder with Vista or Windows 7.
I'm on Win 7 64-bit and haven't had any blank Fusion windows issues like you're seeing.
Except for when I had the IE9 beta installed for a day.