Hi wbsimey,
Logs (compressed /usr/NX/var/log and /var/log directories) would be useful. Please follow the instructions here on how to enable and extract them: https://www.nomachine.com/AR07K00677.
You can submit here, or if they are too big, then you will need to send them to issues[at]nomachine[dot]com. Make sure you reference your topic
title.
Best regards,
Bilbotine