I have tested on multiple computers now it’s only the one laptop running LM 20.1 which has a problem. I’m certain it isn’t a server issue but instead a problem with the laptop I’m using to remote with. Desktop with LM 20.1 works fine as does Windows computers.
The laptop is headless and I’m checking on other forums for ensuring some of the other states. I am locked into Nvidia performance mode and even with multiple monitors in use NoMachine window is black when I remote.
This makes even less sense. The LM 20.1 laptop which is getting the black screen can remote into the Windows computer which I’m using as a backup. So it appears to be that one laptop can’t remote into one computer. Talk about annoyingly intermittent.