The TheThe Slider Plugin was registering the 1.6.4 jQuery library. Commenting out the lines below in thethe-image-slider/thethe-image-slider.php has fixed the problem.
wp_deregister_script( ‘jquery’ );
wp_register_script( ‘jquery’, ‘https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js’, false, ‘1.6.4’);
wp_enqueue_script( ‘jquery’ );