Trying to Keep the Front Page Open

I'd like my Buddypress 1.2.9/Multisite 3.2.1 network closed to members only, but want the front page open to the public. I'm using the Default Buddypress Theme currently. I thought I could perhaps use the exclude features in this plugin: but the Sitewide Privacy plugin must be overriding this functionality, because the front page is still blocked.