Viadat,
Thanks much for your help in trying to track this down.
Turns out that there was extraneous code left in the footer.php file that was hacking the older version of the plugin. With that modified, everything is working again.
Thanks again-
Jeff-
#2 code change does’t work.
#3 Theme change does work.
And thank you for your time!
This happened to me today. I was able to access the mySQL database through my hosting account admin and manually remove the permalink_structure entry.
In the database, I found the wp_options dataset and then the option_id 34 labeled “permalink_structure”. I cleared and re-saved this field.
When I reloaded the WP admin, the permalinks panel reset.
Good Luck –