Private Forums Disappear After Login

[ABD_Ken]

I'm new to this, so please forgive the inanity of the question. I've set up a forum for our customers with some general forums and a private forum for specific classes of customers. If you go to the site, all forums are visible. If you log on, however, all the private forums disappear.

I would like to configure it so that the existence of the private forums are visible to all users, but the content of the private forums is hidden from all users except those explicitly authorized for that content.

I've fiddled with this for awhile, and can't quite get it to work. Can someone kindly steer me in the right direction?

Thanks!