It started happening this week. I'm running windowns Arm on my iMac M1 on full screen on a separate "windows". So, I can switch back and forth between Mac and Windows with a finger swipe. Very often when I switch back to Windows, the screen is black. I can see the mouse course changing (if text, etc) but I can't see anything. The only option I have is to reset the Windows and lose everything I had opened. I'm on Parallels 16. Mac OS 11.5.2 Are you guys forcing me to "upgrade"-buy the Parallels 17?