Awesome! We're getting there. That eliminates a helluva lot of possible causes. From here, can you:
* Re-enable the JomSocial plugin
* In the JFBConnect configuration -> Profiles area, disable all features (no avatar, no cover, disable always import, and no profile fields to import).
* Try again.
* If that works, start re-enabling features starting from all profile fields, then "Always import profile", then "import avatar", then "import cover" then "Import status"
Let us know exactly which step fails there.
Beyond that, you may also want to load your profile in the JomSocial admin area and make sure there aren't any issues there (duplicated fields, wrong/invalid profile type, etc). Somewhere, something is different about your profile than all others when importing data.. but not sure what. Definitely on the right path. Thanks for your patience and sorry we don't have a magic bullet I can just give you to get you going.
Thanks,
Alex