Weird colour distortion in OS X Mavericks

Hello
I got some weird looking colour distortion going on in my recent installation of Mac OS X Mavericks on my mid-2010 MacBook Pro. Any suggestions on fixing this? Is this a known problem? I only have it on some places in some occasions...
Here's a screenshot:
It's not my screen since I can take a screenshot of it...

Same problem - macbook pro mid 2010, 15 inch. I ran the AHT test, it showed nothing so I took it to the store I bought it at. It passed all diagnostics and they could not reproduce the problem (?!). Apple has refused to fix it as it is not currently viewed as a hardware problem. I brought the laptop home and within hours I have distortion on the top of the desktop and a thick black outline around the open window. I think this may be a software issue, within Mavericks, not related to the GPU/logic board/nvid/motherboard issues I've seen referred to in similar posts (I hope so, those hardware fixes all seem to be bunk). See link below.
http://9to5mac.com/2013/11/15/apple-seeds-first-os-x-mavericks-10-9-1-beta-to-de velopers-with-focuses-on-mail-graphics/

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