Same problem: Cura only launches when I have only one of my screens active. Dual 4K Samsung monitors.
I don't have the Nahemic driver anywhere in my services list, so I can't disable it. I also tried disabling "Restore window position" within Cura, but when I enable my second monitor again it keeps only showing a white window on my Windows' taskbar quick preview. EDIT: I was messing around a bit to try to get it to work... Turns out you CAN get it running using a program called BorderlessGaming. Problem is it only works in fullscreen without minimize/close etc. buttons... But it does run for now!