[Burt Adsit]

Sounds like a user switching/authentication problem. When bp talks to bbpress it uses xmlrpc and then uses the logged in (in bp) user’s credentials to work in bbpress. Only for creating posts and topics. Creation of forums and reading topics, posts goes under the utility user that gets setup in config.

Do you have the var: $bb->bb_xmlrpc_allow_user_switching = true; declared in bb-config.php? If somehow bp/mu is confused about the var: $current_user->user_login then it will have problems authenticating your normal users on the bbpress side.

Don’t use the LDAP plugin and don’t know what the implications for authentication are in xmlrpc. This does sound like it’s related to that. Your users can’t authenticate on the bbpress side so, failure.