I had been on the 21.21.13.7653 (NVidia’s 376.53 drivers, notice the last five digits of both version numbers match) that whole time since it was released at the end of 2016. I’m on Intel i7 (with on-chip Intel HD 4600, but it’s not connected or used) and a NVidia GTX 560. I just updated to the latest 21.21.13.7866 (NVidia’s 378.66 drivers) and still don’t anything strange. As stated in this other thread, latest MonoGame no longer uses OpenTK on DesktopGL. Have you tried the development build from monogame.net? We should also have a 3.6 release out in the next week.