I have a concern regarding your Ultimate Facebook plugin. When logging in from the wp-login.php page, entering the normal Wordpress username+password send the user to the main blog page by default. However, if the user logs in with Facebook, he is sent to the dashboard, which is very strange.
In my Ultimate Facebook plugin settings, I left the default option for Facebook Connect redirection (Site URL, with no additional fragment). It doesn't work. I've tried to add a fragment so in theory it should be redirecting to an existing frontend page, but it still sends me to the dashoard.