hi Alzander,
about the admin login:
friday i updated acesef to the current version, and seems the problem was solved. maybe acesef was the reason for the infinite loop.
I asked the user that was having the same issue in the other topic if he was using acesef but i didn't get a reply.
Regarding my user's fb_connection, i saw your latest test. I'm wondering why the user with ID451 wasn't able to login. As you can see the username was not imported properly (you can see it has the fb_ID)