OK so.
today it happened again. Logged into the host through NoMachine, and the mouse had no effect. One shell window happened to be “on” so i started xev in there. Its little box window appeared, and I tried to click it, with no visible effect.
During all of this that shell lost focus, And I couldn’t get that back remotely.
Asked someone in the office to turn on the host terminal and click onto something, that unlocked the situation completely, also on the client.
So the log of that experiment is attached. I hope it contains some useful information to resolve this crazy situation.
Let me know…
Thank you!!!