I came across this plugin on a client's site, and noticed that it's loading an outdated version of jQuery UI.
On line 216 of wp-ui.php, the jQuery UI script that is being registered is an older version:
wp_register_script('jquery-ui', 'https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.21/jquery-ui.min.js', array( 'jquery' ), '1.8.21' );
The latest version currently in the Google Library is 1.10.2: https://developers.google.com/speed/libraries/devguide#jquery-ui
I just wanted to point that out. Thanks for the plugin!