Buddypress Social Theme 1.1.5 Private Message Broken

Buddypress Social Theme's send private message system is broken. A test member could not send any private message or receive any using Buddypress Social Theme 1.1.5 with Buddypress 1.2.1. Please help me fix this, because this is urgent and an important part of any social network.

Testing with Firefox 3.5.8 using latest Buddypress 1.2.1 and latest Buddypress Social Theme 1.1.5 and latest 2.9 multidb and latest wordpress mu 2.9.1.1.