Cannot get access for new usergroup
 

I created a new Usergroup named Subscribers, based on Registered users and so there are no differences that I can see between the two groups. If I change a user from Registered to Subscriber, though, that user no longer has access to any forum.

When I have this working, I'll add a paid subscription and then change the forum permissions.

I'm sure there's something simple I've overlooked, but I can't see it. Any help will be appreciated.