Site Blank After Login

I just re-read your Private Message and looked at the image again. It looks like you're running JFBConnect v5.2.2 on that site. We release JFBConnect v6.0 yesterday which should fix many of those issues:
* The strict warnings about bindData are fixed
* The Open Graph debugger has been replaced with a toolbar at the bottom that can easily be hidden on any page (or disabled using the Permissions as described above)

In your image you highlighted another message about JParameter. That's not coming from JFBConnect.

I hope that helps,
Alex