Can one of you Private Message me admin access to your site so we can test with your configuration? Like I mentioned, we did make a change in 4.2.x for the URL generation. It's been out a few weeks now, and we haven't heard of issues, but obviously, we'd like to fix any problems that may exist.
Also, let me know exactly how the current Open Graph tags are being added (when it doesn't work). I'm assuming you're just letting JFBConnect add it automatically, but if not, let me know.
Thanks, and we'll get you straightened out,
Alex