Using Windows 8 and Nvidia GTX660.
Using a windows 'theme' as desktop
Sometimes on my desktop I see small random rectangles or squares of the wrong colour displayed. I can't work out at what stage they appear, but I can easily get rid of them by switching to another theme and then immediately returning to the original.
This doesn't happen anywhere else but on the Windows desktop.
However, I have a need to know what is causing this, in case I need to have a component replaced on warranty.