This has to be a driver problem. And it seems to happen with NV cards, mostly. When Win10 installed my default NV driver package, it seems to have defaulted to 4K UHD 30Hz, but this display is capable of 60Hz, 4:2:0 Chroma sub-sampling. But if I go into NVidia Control Panel, and set those parameters, the mouse cursor turns half-sized, vertically, like it's compressed. It did it with both the default Win10 drivers, and the newest NV drivers I just downloaded tonight. What's going on here?