Here's how simple it turned out to be. When I save and quit...., if I reboot the computer before I start the next session everything works.
If I don't have a reboot between sessions (and if I get completely out of Turbocad of course) then it does NOT work correctly.
That probably means I'm keeping enough stuff in memory from the last session to make me short memory?
The weirdest thing is that I've never had such a thing happen before with my older versions.... so it's a new thing.
But, the problem has been solved. Thanks to everyone for all the help.