After the user's screen has been locked and unlocked, the client mouse pointer is no longer in sync with the server mouse pointer. 

Steps to reproduce:
- Open the NoMachine session in a maximized window,  not at fullscreen.
- Lock the macOS client's screen
- Unlock and reconnect the NoMachine session.

Note that such behaviour is not always easy to reproduce and may require many attempts before getting it. When reproduced, the mouse pointer is out of sync and clicks somewhere else than where it's displayed on the screen.

As a possible workaround, resize the session window on the macOS after the reconnecting. Such workaround works until the screen is locked again.