Just an update to that last post. We’ve found and fixed the problem. This was all backend issues. The database upgrade meant to improve speed and access actually changed a very subtle object that in turn required some digging in the code and, of course, a very small tweak in the code. Murphy’s Law!
I would call the hosting service and argue with them about their upgrade windows but I’m fairly certain that my business is a a pretty small fraction of their overall revenue.
We’re free again to Enjoy the Wine Life!