As a follow up to my post an hour ago, I did go ahead and uninstall/reinstall TurboTax 2022 Home & Business from the CD. It was painless... it didn't even ask me for the registration code again.
I opened the existing 2022 return (it found it immediately by itself), and went straight to FILE. It remembered all of the info from before, including drivers license, etc, and the fact that I'd already paid for eFile, and the Alabama state return went through successfully on the first eFile attempt!
The cause of the error is still a mystery, but it's RESOLVED now!
