Looks like an incompatibility with the latest version of jQuery as pulled in through googleapis. The plugin pulls in the latest version automatically, add this to your theme’s functions.php as a temporary workaround until the plugin is fixed:
function thethe_fix() {
wp_deregister_script('jquery');
wp_enqueue_script("jquery", "//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js", array('json2'), '1.8.3');
}
add_action( 'wp_print_scripts', 'thethe_fix', 20 );
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Note that this will fix your site onto version 1.8.3 of jQuery, which might not be a good thing long term.