bbPress & MU problem

Hi,

The user logins work fine from MU to bbPress, but for some reason bbPress is not letting my users post or reply in the forums.

Also, I tried the Private Forums plugin to keep non-users from accessing the forums, but it keeps my logged in users from accessing them as well.

Anyhow, users can't post even with the plugin disabled.

Any thoughts?

Thanks folks,
Gray