I had a problem with this extension using jquery version 1.6.1
When clicking on an image it should enlarge in a lightbox. I was getting this javascript error:
I discovered the solution here:
unfortunately, I can’t post the link of where I got it 
apparently I’m too new.
I fixed by changing
Line 462 in FBGallery.php from
'rel'=>$rel,
to
'rel'=>"\"$rel\"",