Hello @oldrunner,
Thanks for writing to us.
Are you pointing to this page www.example.com/wp-admin/nav-menus.php
I would suggest you troubleshoot with a few of the common issues before we investigate your settings.
If none of those work, It would be best if you could copy your live website to your staging area. and send your details in a secure note so that we can investigate your setting without breaking your live site. Please provide the following details
- WordPress Login URL
- Admin-level username and password
- FTP Details
You can find the Secure Note button at the bottom of your posts
Thanks