I get a blue rectangle appearing when I play video in a browser, like an overlay, which can be persistent. Screenshots inside.
**Problem**
Every time I play a video in a browser, a semi-opaque blue rectangle appears over the video. It happens regardless of browser (Chrome and Firefox so far) and regardless of website. The rectangle remains for an indeterminate amount of time before disappearing, and can re-appear unpredictably. I'm fairly certain that fullscreening the video doesn't remove it, and the only way I can actually get rid of it is to CTRL-ALT-DEL which displays the user menu (log out, start task manager, etc). It doesn't show up in screenshots, and it doesn't move with the video when I move the browser.
**Examples**
Here's a perfect photo of the problem: [screenshot1](http://imgur.com/uEkGdGG) (3MB, photo of monitor)
The worst situation is when the rectangle persists between videos and even between browser instances. See this second screenshot - note that before taking this I had loaded a video in YouTube, closed the browser completely and loaded it back up.
A photo of the persistent rectangle: [screenshot2](http://imgur.com/gUPzpd2) (2.2MB, photo of monitor)
This occurs on my laptop (spec below), but also my desktop system at home which has a very different set of hardware, but the same O/S (Windows 7 x64 Professional).
**System**
This is a Dell E6540 laptop with the specs below, but DxDiag didn't seem to provide information about the second adapter, namely the AMD Radeon HD 8790M. This kicks in for gaming, so it's rarely used (and isn't used for web video as far as I know).
The full DxDiag dump: [DxDiag.txt](https://dl.dropboxusercontent.com/u/28151533/temp/DxDiag.txt)
edit: I had copypasta'd some of the DxDiag here but the formatting wouldn't respect new lines, so please see the full dump in the above text file. Sorry! :)
I haven't managed to find what the cause of this is yet, and it's starting to really drive me up the wall, not to mention affect the videos I'm watching. Which aren't just GameGrumps, I swear.