Disappearing Dashboard

I had a working wpmu and buddypress installation.

I went to install bbpress and everything appeared to work as advertised. I can get into the forums and their dashboard.

My wpmu install appears to be functioning as are the buddypress pages.

The thing that isn’t working is the wpmu dashboard. It gives the page at the url requested but it is blank. No errors, no page not found. Just a blank page.

Has anyone else encountered this?