Update: The three sites I updated last week were to DT Register 4.2.2. They are NOT having this problem.
The site above and one other were updated to 4.2.3 - THIS is the version that seems to introduce the problem described above. Tested in Internet Explorer, Edge, and Chrome.
I think I can update sites to 4.2.2 with the IE JS patch. Is there any chance that I can install 4.2.2 over 4.2.3 to get this to work on the site above and the other site? They're effectively "down" with this issue.
Thank you,
Ernie