Blank Page On Login

New BuddyPress and WPMU install at

I reach the login page at http://austellfellowship.or/wp-login.php and log in successfully (I think) and am presented with a blank (white) screen and the message "Done" in the lower left status bar.

After "apparently" logging in, the page URL continues to show http://austellfellowship.or/wp-login.php rather than http://austellfellowship.or/wp-admin.php so it appears that although I have logged in, the script has failed.

The is the active theme and bp-global-adminbar-css.php is installed in the mu-plugins directory.