Keen,
Very strange, but I think I got it worked out. It was a weird issue where if none of the settings in JFBConnect were configured, a PHP loop could occur. Never heard about this from anyone else, so not sure if it's a plugin ordering issue or a server configuration that is overly agressive and simply doesn't like what we did.
Either way, I got it to work by saving some blank settings for you, and things seem good now. Please test, and hopefully, you won't run into any other issues. If you do, let us know!
Thanks,
Alex