I do have an issue with DK2, but it's windows/nvidia problem. I run 2 screens and a DK2 off a GTX980, all different Hz speeds. Occasionally I find that the colours on the DK2 get change somehow and everything comes up like it's been posterized. I fix it by going into the desktop "screen resolutions" settings, changing my primary monitor to the DK2, then back again to my primary screen, and the colours switch back to normal. It doesn't matter if ED is running or not when I do this, it still works. I use the second screen API on an older LCD TV for the Mrs to watch. Hope this helps.