Please try the following and let us know if it helps. Connect from Windows 10 and disable the hardware decoding:
i) inside the NoMachine session open the menu (ctrl+alt+0 or click on the page peel in the upper right corner).
ii) Access Display -> Change settings and tick the ‘Disable client side hardware decoding’ option.
iii) Then on Windows 10, launch the client and click on Settings -> Player preferences -> Privacy tab and select ‘Don’t delete log files on exit’
iv) Connect to the server and reproduce the black screen problem.
v) On Windows 10, create a compressed archive of the .nx directory in the user’s home.
The .nx folder is hidden. To find it, write the following in the address bar or the file browser: %USERPROFILE%\.nx Send the log archive to us as email attachment to forum[at]nomachine[dot]com making sure you use the title of the topic as the subject of your email.
Thanks!