I have given you the solution alreadySTOP the presses.
I spoke too soon. 5 hours after the 'repair', and 5 hours since the last popup--it's back.
Restarted in safe mode; then back to regular mode. No change--still getting it.
Back to tech support tomorrow. Totally burned out right now!
Regarding the beta, indeed no way to downgrade but that also says in the agreement.