Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have a strange issue that happens with both the Chrome and Safari browsers. It only happens when the browser is maximized on my 2nd monitor.

A rather large (toolbar sized) rectangle obscures the top-left of my window. It occupies about half the screens width and is a few textlines high. It is filled with junk or old screen contents. It does not scroll.

Hard to describe but here is a screenshot (I've added the red box).

enter image description here

So, is this a known problem? Anything I can do about it?

share|improve this question
Well, at least I guess it's safe to say that it's Webkit related. – Oliver Salzburg Mar 17 '12 at 17:41
@OliverSalzburg - yes, that kind of reassured me. Makes malware less likely. – Henk Mar 17 '12 at 17:47
Operating system? – iglvzx Mar 18 '12 at 18:22
It's running on Win7 HP, SP1. Second monitor on HDMI, both are 1920x1080 – Henk Mar 18 '12 at 18:26
Do you have DWM disabled? – Tom Wijsman Mar 19 '12 at 14:56

You have to update video drivers since modern drivers do not allow to reduce hardware acceleration level on Win7 to eliminatie "artifacts"

share|improve this answer
But what makes you think that this is an acceleration artifact? – Henk Mar 18 '12 at 18:47
Because millions of others do not have it? – ZaB Mar 19 '12 at 0:12

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.