Bas Middelham

The curCSS method had been deprecated since jquery 1.8.0 so the plugin should be updated to work with the latest version. I fixed it by loading version 1.7.2 using this script in functions.php

if( !is_admin() ) {
    wp_deregister_script('jquery');
    wp_register_script('jquery', ("https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"), false, '1.7.2', false);
    wp_enqueue_script('jquery');
}

Same problem here. I’m using a custom theme and switching themes does not help.