Cannot send private messages in BP 1.2.1, caused by Multi-db?

Hello,

I am using BP 1.2.1 WPMU 2.9.2, Multi-db 2.9 plugin, domain mapping, post-indexer, sitemaps & all-in-one MU, anti-splog, Google analytics, vipers video quicktags, recent global posts, akismet, cforms, exec-php, feedwordpress.

My users are able to use @mentions, update their profile, avatars and every other function of buddypress EXCEPT private messaging.

I keep getting There was an error sending that message, please try again whenever you try to send a message.

And I checked in wp_bp_messages_messages and it looks like no messages were created since i upgraded from bp 1.1.3 to 1.2

I was wondering if Multi-db was the reasoning for this.