Well, I have not had any luck with stopping any member from posting in restricted groups. I do believe there is an issue with the way the plugin is designed and not working as it should with groups and restrictions.
Flaws I have found:
1. You can make a category and sub categories and implement them into a group with the restrictions for only group members to have access too, but you can not stop any registered or unregistered user from posting in it, and the post shows up in the latest ad section, that should not happen. Attached pictures below.
2. If a user clicks on the Category Icon in the select category list, then the restriction group will show, but registered and unregistered users can go to publish a listing and still post in it, and that should be restricted unless the member belongs to the group.
3. Private groups should not be accessible to any publishing, unless you are a member of that group.
I do understand that you can not see the content of the published post with the restrictions if one is posted, but there is no privacy for regular member or group members if everybody can see a private category post, so I have to think this plugin is not for private groups and can not be set in any way to have complete privacy for members or non members when other people can post in a restricted group being unregistered or registered members.
so we don't get off track, if I select All Categories in the (Category for latest item) in my delta theme, I want to be able to show everything to the members except the categories that i want restricted to show. I know we can pick from the category list and change it, but that will only show postings from that category and that is not really good because all viewers want to see everything that is posted and not from only one selected category, unless you want to set it for only one category to show.
If I can restrict category Rendezvous (from being published in) unless your a member of the group and not show anything to the public and only to the group members of that group with All Categories listed in the (Category for latest Item), that would be good.
If I have a category made for only Ecommerce members, I only want them members to be able to publish in it and the (content viewable to all members). That would be great too.