I may be related to #15795 or #15749

This may help #15806

csthomas I tried your posted update queries and it did not solve the issue for categories. Can you tell me which files are associated with filling that select box?

At first, do you have any categories (backend) in category list?
If you do not see any, please change filter list to show all (with trashed).

If you have all categories trashed then my PR should resolve your problem, but...

1. This queries should to be run before you update to J3.7 - this queries repair published state before joomla run own queries from J3.7 update files.

2. If you run this queries on updated J3.7 then it should be ok but you have to now publish every category manually.

First, thanks for the assistance. I do see categories in the list and I have emptied the trash. I ran the queries and they executed properly. I then updated to 3.7. Same issue. No categories listed. If I add a new category I can see it in the list of article categories.

As a note, If I change a category's access to public it shows up in the list of categories in the article. If I change back to another access level it no longer shows up.

Sounds like messed Joomla ACL. I would just try to re-save my user account just in case this fixes it if lucky, if not, create another new super user and login with that one see if things are different.

First, thanks eorisis. I tried modifying the superuser account and saving it. No change. I then added a new superuser. No change. I added the old and new superuser to all access levels / groups. Then, the categories show up in the articles to be chosen. I then changed one of the categories access to super user and it shows up in the article to be chosen. Any way to correct this where it works as it is supposed to?

So, I did a completely new Joomla 3.7 install and created various access levels and groups which super user was not checked. Then, I created some categories where access was in some of the new access levels I created. Next I tried to select one of the new categories as the parent of another category. It does not show up in 3.7 but does in 3.6.5. I then changed the access to super users and it shows up for selection. Is this a new feature of 3.7 or a bug? Looks to be a bug as it would break many installations

This seems to be a 3.7 issue. IT ALSO affects Contacts as well as Articles.
If I had Contacts and their Categories all as Guest it did not list them when editing the contact.
I had to change them all to Public.

Anyone have updates on this issue? Will 3.7.1 correct this?

also have the issue in 3.7.0 in the category selector box.
I think is this line https://github.com/joomla/joomla-cms/blob/staging/administrator/components/com_categories/models/fields/categoryedit.php#L189 that causes the issue.
when i deleted that line it worked like it worked in 3.6.5.

maybe that line needs to be inside a if (!$user->authorise('core.admin')) to allow super users to view all.

Closing as I believe this was resolved with #16411. If that is not the case it can always be reopened