I have flipped all of the options including hardware encoding and decoding on the client and server. None of the options seem to make a difference.
After doing a bit more testing I have discovered the following:
1. This doesn’t happen if the NoMachine client is running in a window.
2. This doesn’t affect Windows NoMachine clients at all, full screen or windowed I can’t replicate the issue on Windows.
I have flicked the logs through.