What works well is that the groups have different permissions based on 'node' permissions. So an advanced group has access to more nodes than a 'registered' user - which is the bottom level.
However, we have to click the 'registered' as secondary user on all of the users for this to work. I have tried giving the other user groups permissions to read all forums etc, but they are still blocked unless i click secondary permissions 'registered' for a user.
What am I missing? Is there a setting for user groups that I have not set properly to give them forum access?