AED,
Glad to hear the {SCOpenGraph ..} tag is helping fix your issue. I'm not sure why setting the description would be fixing the title either, but glad to hear it is!
As for the issues with values appearing and dissappearing, when you say "dev" app, do you mean the debug tool,
developers.facebook.com/tools/debug ? Although I know you said you're ok with the current behavior, we like to at least know of issues to possibly investigate before others may run into the same things. Definitely strange that things change.
For the user that is being automatically registered, you can fix that in a few ways:
* Simply disable the "Automatically login Facebook Users" option in JFBConnect
* To really resolve the issue, you should to go into Facebook.com -> Account Settings -> Apps and delete your Application from that user's account there. Once the app is approved, and auto-login functionality won't trigger because Facebook won't report that the user has approved the app.
Hope that all helps get you going, but if you have any questions, let us know. Finally, no problem for the support, it's what we're here for!
Best of luck,
Alex