Yeah.. half of it is gone....It woesn't like this yesterday...and ...now it is.
any help?

This problem happens to me to. I think, but im not positive, it's associated with Vista. This hasn't been happening to me recently, I run it as an Admin.
When it was happening to me, when i minimized it and then maximized it, the white box when away.

It is a very annoying glitch/bug though.

you turned shaders on right?
that happens to me when i do that and thats because my notebook its not able to get shaders =/