This is going to be brief because I just spent 45 minutes typing out a detailed version and this site errored and lost it

Steps to reproduce the issue

1. New Joomla 3.6.2 install w/default sample data
2. Add new group 'sectionA' w/parent Registered
3. Edit Access Level 'Special' and add new group 'sectionA'
4. Edit Global Configuration -> Permissions and set group 'sectionA' -> Administrator Login = Allowed
5. Add new Category 'bobsBlog' and set Permissions for 'sectionA' all to Allowed (create, edit, etc)
6. Add a new article and save it in the new category 'bobsBlog'
7. Add new user 'Bob' and put him in the new group 'sectionA' (be sure to activate him)
8. Log into the administration area with Bob and try to edit the new article

Expected result

Bob should be able to edit any article in the category.

Actual result

Bob gets an error message "Error Edit not permitted"

System information (as much as possible)

PHP Built On Darwin SDC-iMac 14.5.0 Darwin Kernel Version 14.5.0: Thu Jun 16 19:58:21 PDT 2016; root:xnu-2782.50.4~1/RELEASE_X86_64 x86_64
Database Version 5.5.42
Database Collation utf8_general_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 5.6.10
Web Server Apache/2.2.29 (Unix) mod_wsgi/3.4 Python/2.7.8 PHP/5.6.10 mod_ssl/2.2.29 OpenSSL/0.9.8zg DAV/2 mod_fastcgi/2.4.6 mod_perl/2.0.8 Perl/v5.20.0
WebServer to PHP Interface apache2handler
Joomla! Version Joomla! 3.6.2 Stable [ Noether ] 4-August-2016 23:41 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36

Additional comments

Bob can create a new article, but as soon as you save it the first time, he can no longer save it again or edit it after closing.

edit
I should add that the article can be edited and saved from the front end, so the issue is only with the admin side.