To fix the issue for WordPress 3.9, pls replace the code –
wp_enqueue_script('mo-admin-js', MO_SCRIPTS_URL . '/admin.js');
in line number 618 of framework/framework.php file with
wp_enqueue_script('mo-admin-js', MO_SCRIPTS_URL . '/admin.js', array( 'jquery-ui-sortable', 'jquery-ui-draggable', 'jquery-ui-droppable' ), '1.0', true);
I will have an update this week for this week with this and other changes but meanwhile the above should do the trick. Thanks for bringing this to my attention.