Can you check the admin Requests area, click into the Request you sent, and view all notifications. See who the Joomla user is set to for the notification.
I know you've made a lot of changes to how JFBConnect detects and logs users in. My only guess is that there is a problem with a change you've made. However, if the "Joomla User To" column shows a strange user, that may help explain the problem as well.
Thanks,
Alex