Problem with viewports in MED

Hello,

Posting this here; not sure if there's a more appropriate spot, but it's MED related (though it also happens in WED viewports), so I'm posting it here.

I recently re-installed C7 on my system and am going through MED, doing the tutorial to refresh myself, etc.

However, I'm running into a problem with it now when using it. When I try to drag a selection around something, the entire viewport goes white and I see "echoes" of the selection border, until I release the mouse-button.

This is problematic because it makes it impossible for me to see what I'm selecting and I end up having to "guess" at what I have the border around.

I've never had this problem in the past with the editors and I'm wondering if anyone has any idea what might be causing it?

Here's a link to a screenshot of the problem: Click Here

I have the most up-to-date video drivers and I've tried adjusting the GXL settings (DX9, 9a, etc), but none of them make a difference.

Any help is appreciated.

disable aero.

(it's like billionth time i give this answer. )

But it's only the first time I asked

(I did a search, but didn't find any response... probably didn't search for the right terms)

Thanks for your help