Then please go back to “System Settings” and go to “Display and Monitor” -> “Screen Saver” and please share what’s set in the “Settings” section. So which options are checked and what are their values.
Did the above instructions have any effect? If you are interested, we also have a patched package that we would like you to test. Can you contact us here: https://www.nomachine.com/contact-request, referencing your forum post?