Refresh! pleasee!

Hi!
I need some help on this:
When I press tha space bar to "maximize" a viewport maya (or my graphics card) doesn't refresh the view.
If u don't have a better solution I'd like to know how can I make maya to execute the refersh command everytime I press the space bar.

thanx!

Its a vide driver related problem either get a older driver or newer depending on card and circumstances