Your Portfolio tags are coming from either your theme or another plugin which I certainly did no test.
You can add this to you wp-config.php
define('WP_DEBUG', true);
define('SCRIPT_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);PHP errors will be logged in wp-content/debug.log
You can use Firebug to debug Javascript.
