The Antipodes/Roon Server returned to the old behaviour after a couple of days. A few days after the issue was resolved I had start bouncing Roon Server to get it to start; after a few days Roon Server just failed to start, having the same behaviour as before, stopping at the point in the start-up process.
Sorry all, I really do not want to bother you with this - do I raise another ticket or can this one be reopened.
Cheers,
Ray