I'm still continuing our evaluation of Dolphin. We need private group functionality with security of sharing within groups paramount. The only thing I've been able to find in the forums or documentation is this post, which suggests that private groups don't really exist:
https://www.boonex.com/forums/topic/Private-groups-strange-behavior.htm
Experimenting with our test setup, I confirmed the above behavior. I created a group, set every permission in the group menu to "members only". Then created a forum post for the group.
Logging in under another user name, the "private" forum post was easily readable.
Dolphin Pro is useless to us as far as I can tell from this behavior. Am I doing something wrong at this point? Time to explore Jomsocial perhaps?