Along the lines of what ~suv reported, this happens when you have certain software which accesses the Desktop Window Manager (DWM) frame buffer. In my case, I was using an app called 'deliner.exe' which reduces the interlacing effect to some IPS monitors when running at refresh rates higher than 60. A temporary fix is just to quit out of the app using the Windows task manager.
Along the lines of what ~suv reported, this happens when you have certain software which accesses the Desktop Window Manager (DWM) frame buffer. In my case, I was using an app called 'deliner.exe' which reduces the interlacing effect to some IPS monitors when running at refresh rates higher than 60. A temporary fix is just to quit out of the app using the Windows task manager.