The pictures you sent, that's of the configuration that *works* or *does not work*?
We've been doing some quick testing and still can't get a 500 error to show. I'd definitely like admin access, if possible, but I don't want to install JFBConnect and cause a 500 error as there's not much I'd be able to do to fix it. If you can test (since you can fix the error through the DB when it goes wrong), the best thing to do to test is:
* Go into your Joomla Global Configuration
* Disable GZip compression
* Set "Error Reporting" to maximum
* Turn "System Debug" to "On"
Cause the error to happen. Take a screenshot of the page and let us see it. Hopefully, with the error reporting enabled, that will provide more information as to where things are failing.
Finally, one last question. When you install JFBConnect, it doesn't fail. It only fails when you enable one of the new Open Graph plugins? Do you know what plugin you enabled that failed?
We'll help you get to the bottom of it, and thanks,
Alex