When you login with those credentials, what happens when you go to /profile ? We've tested from multiple computers and get the error message Melissa posted. The query is trying to load data from the SOCIAL_USERS, SOCIAL_AVATARS, SOCIAL_POINTS_HISTORY and other SOCIAL_xyz tables. None of those tables are from JFBConnect.
The Logout button from the SCLogin module works on the home page. If it doesn't work on the /profile page, it's an indicator that there are other issues with whatever extension you're using for profiles.
I hope that helps you narrow things down, but the original issue with the SCLogin module is fixed. I don't think there's anything else we can do for the remaining problems. If you feel JFBConnect or SCLogin is the cause, please explain why and we'll gladly help to investigate further.
Thanks,
Alex