I mention again, that all users who were not using server NoMachine 4 can still login with normal desktop on version 3.5
Could it be that NoMachine somehow does not release thoroughly running applications when stopped with alt-F4 -> terminate ?
When the server is rebooted, he says, “The graphical interface was closed 6 times the last 90 seconds, in 2 minutes we will try again on :0”
The latter text was translated from Dutch, so it will not represent 100% the English text.