Odd in that I didn't see (at a glance) any other such reports from HiFiBerry users on the Moode forum, however over time there have been others who had an in-place update go awry, and the only answer was a clean install.OK. I reinstalled from scratch and that seems to have fixed the problem. Not a great user experience, however.
There is a function with which you can backup and save your known working system parameters, so that any clean install is then faster to get up and running. I've never used it but probably should, it even saves the internet radio stations which is something that has it's own backup/save utility, and I have used that successfully, it does save a bunch of time not having to reconfigure the radio stations, so I should probably just utilize the full system backup instead:
m ➞ Configure ➞ System ➞ Backup/Restore
This will be especially useful with the forthcoming Moode 8, which won't offer an in-place update to existing Moode 7 instances because it will be built from the new Raspbian 11 (Bullseye).