Not sure how long this has been going on, but I recently discovered that our Item Set pages all display the error message “The page you are trying to view does not exist. Use the back button to return to the last page.” All the item sets, and items within, are set to public view, and the item pages themselves all exist, but none of our item set pages are functional. This includes a test item set and test item I just created - item page exists but the item set page does not display.
We had to revert to an earlier version of Omeka after an upgrade mucked up some modules/settings - could be a factor/the origin of what went wrong here. Any advice is much appreciated, we’re volunteer-run/a bit amateur over here so we appreciate your patience and help!