The issue we reproduced looks to be something different to the problem on this thread, as it was caused by multiple GPUs on the test machine (an unsupported scenario).
Now we have the GTX 670 as the only graphics card, it is working fine. Suspicion is that this could be something to do with Windows as it sounds like we are rendering the pixels that Windows gives us onto the USB display.
Could someone record a quick video to show what they are seeing? Also, when you see the problem, can you "print screen" and paste it into Paint, and see if this is the same as you are seeing on the extended screen? If so, then this sounds like a Windows issue with multiple displays and Windows not correctly rendering the desktop to all displays.
Wim
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