Hey guys, sorry we didn't post the solution here.. I thought we had. The 3.3.0 release of JFBConnect (for J1.6) will be posted later today, or tomorrow at the latest, which has this fix. If you want to do it yourself temporarily, it's very simple.
In the /plugins/content/jfbccontent/jfbccontent.php file, at line 22, update the very end of the line to add a default to the $limitstart value, like below:
... , &$params, $limitstart = 0)
This is something that changed in J1.6 that we weren't aware of. Again, this will definitely be in the new release.
Thanks!