Actually such issue happens very frequently. When the session is terminated, the Win10 player window shows login window, and if you try to login immediately, it will report “cannot connect to nomachine monitor”. I think nxserver will just terminate the session and start new one, before new session is ready, the login attempt will just go back to login window.
You will encounter this time to time. Not only resize the window in desktop will cause it, sometimes just try to drag the window will cause this too. or just open a big program will have chance to get this as well.
Is it because of the GPU driver in VM platform? I can see a lot of graphical card in VM platform that I can choose, not sure which one is better: