Thanks for help narrow it down to the system plugin. I figured that was the case, but necessary to start somewhere.
Most likely, the problem is caused from AJAX requests getting interfered with by our Facebook Canvas Integration. Please try the following to disable that functionality for now:
* Edit the /plugins/system/jfbcsystem/jfbcsystem.php file
* Around line 68, in the onAfterInitialise function, you'll see the following line:
$this->jfbcCanvas->setupCanvas();
Simply put 2 slashes in front of that, like:
//$this->jfbcCanvas->setupCanvas();
If you're not using the Page Tab or Canvas support of JFBConnect, that may be a permanent fix. If you are using those features, please test with that change and let us know if it fixes the problem. If so, we'll investigate further on how to fix it.
Also, please let us know what version of jReviews you're using.
Thanks,
Alex