You also need to fix the url for the loader in mailchimp-widget-min.js … or just replace it with a data url. – http://www.base64-image.de/
On line 40 of ns_widget_mailchimp.class.php the line should be changed to: wp_enqueue_script(‘ns-mc-widget’, plugins_url() . ‘/mailchimp-widget/js/mailchimp-widget-min.js’, array(‘jquery’), false);
This will ensure compatibility with a different wordpress wp-content directory.
Can someone please update this in the plugin?