Well, congrats! You've found a new issue apparently
It looks like there's a conflict between how we're saving things and the RocketTheme admin template you're using. I went into the Template manage and switched to the default BlueStork and was able to manually enter your App ID and API/Secret Keys. That was fun since I couldn't cut/paste from an image! Anyways, that worked.. so, while certainly not optimal, I'd recommend that for now at least, to configure settings in JFBConnect, you switch back to the BlueStore template.
Sorry for the troubles, but hopefully this will help you make some good forward momentum. We'll try to look into what the conflict is more, but don't know how long a good solution will take.
Thanks for your patience, and let us know if you run into anything else,
Alex