I got an ASUS MB168B USB3 DisplayLink screen for my laptop, and tested it first on my desktop system. Worked great, and it is actually a very cool way to get a second screen on a laptop - even plays 720p vids fullscreen at 30fps.
However, it turns out that the software needed to run it, “DisplayLink Core Software”, was causing 32 bit apps (like vvvv) to think my GTX770 graphics card on my desktop only supported DX 10.1, not DX11.
So if you have or get one of these screens, be warned this may happen. The symptom in vvvv x32 is the DX11 Quad throwing errors on the console and not working, and the DX11 Info node reporting Level_10_1. The windows program DxDiag will also report DTI 10.1 on the Display tab. But all will be fine with vvvv x64, and the 64 bit version of DxDiag will report DTI 11.
Just so’s ya know.