Hi fra81, thanks for the reply.
That’s a good suggestion. I didn’t have access to another NoMachine client at the time, but I do now, so I gave it a try with the Linux desktop client – couldn’t reproduce the issue. One thing I didn’t mention – I connect to the ipad (an iPad 2 running iOS 8.4.1) over a USB cable using the tetherme app to provide USB networking. (The server runs on a Raspberry Pi 400 and I use the iPad as a display. Using USB networking means I don’t require an intermediate WiFi, as well as giving better performance). To test if the USB networking was causing the problem, I tried connecting the iPad over WiFi. Again, couldn’t reproduce the issue. So the USB networking is the problem? Tried it again with the USB this time. Again, couldn’t reproduce the issue….
So, I’ve no idea what changed – no software updates or configuration changes happened before this issue appeared, and none have happened between then and now – but it seems the issue has gone as mysteriously as it came
I guess there’s not much to do except close the issue…. until it reappears….