I always use latest version of WordPress and since WP 3.0 i use googl-shortlinks too. But after I update my wordpress to 3.1.1 I got issue :
Fatal error: Call to undefined method Services_JSON::encodeUnsafe() in .../feryardiant.web.id/www/wp-content/plugins/googl-shortlinks/google_shortlinks.php on line 153
after I save my post, please fix it asap. thanks.