Not stupid at all. Facebook changes their app area a lot.. way too much, actually. Sandbox was changed to "Online" about 2 months ago. Either way, I'm glad you found the right setting to get things going for you though. If you need anything else from us, just let us know.
Finally, if you haven't already, please consider leaving a rating and review for JFBConnect, or our support, on the Joomla Extension Directory. It certainly isn't required, but is very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215
Thanks,
Alex