BuddyPress.org

I don’t think there was anything special you had to do back in the BP 1.0 days. User authentication/cookies was a bit of a pickle, and there were a pair of plugins which hid forums you didn’t belong to (or similar).

I am not sure specifically with regards to the forum component, but all the deprecated code is being moved to a seperate plugin. I wonder if this method of forum installation would use some of that deprecated code (and it not being in trunk anyway, which would explain why it doesn’t work for you). I’ll ping a couple of guys and see if we can figure it.