WOW! I did it! Thank you so much. I checked here https://codex.www.ads-software.com/Glossary#P to find out about Post Slugs (I already knew that much) and then thought I would go ahead and change the slug of the Archive page anyway and see what happened.
Magic! I changed it from “archives” to “archiveslist” and now everything works the way it should.
I can’t thank you enough! I have spent days trying to work this out. I never would have thought of doing that. Is there something that changed in the new version because it used to be fine before? Any further info as to what made you think of that or whatever would be great so that I can learn from it. ??
Jen