The problem is solved! Thank you.
I guess I'm pissed at Microsoft. This is the second time in a couple of years that one of their Office or Windows updates crashed MS Access databases around the world. That time there were about a dozen of my customers affected. This time, I had 4 systems from 2 different customers 300 miles apart crash. And I suspect that I will hear of others before this is over. I was say this: those two MS-generated crashes generated some revenue for me, so there is a bit of a silver lining.