I think we got you going. The E_NOT_AUTHORIZED error was likely because the JFBConnect User and Authentication plugins were not enabled (probably because you reinstalled).
Additionally, we fixed the avatar import issue. We'll be releasing v3.0.3 of the full component later today with this minor, minor fix. You're welcome to upgrade to it if you want, but you won't need to since I made this change for you.
Please let us know if you run into other issues or need anything else. Thanks for alerting us to the avatar issue. Facebook changed something on their end, which broke JFBConnect. This happens every once in a while, and all we can do is react as quickly as we can.