If you are having problems with Ajax in the admin menu of JReviews. Try this fix and see if it fixes your issue.

Go to this file
/components/com_s2framework/s2framework/dispatcher.php

Add this code

if($_REQUEST['xajax']==1) return true; // Fix for SERVER loss of HTTP_X_REQUESTED_WITH key

Before the change:

/**
* Detects jQuery ajax request
*
*/
function isAjax()
{
return (isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&
($_SERVER['HTTP_X_REQUESTED_WITH'] == ‘XMLHttpRequest’));
}

After the change:

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