GUID should be urlencoded in template since it is urlencoded in uri as well.

object/Item.php

@@ -325,7 +325,7 @@ class Item extends BaseObject {
 			'body' => $body_e,
 			'text' => $text_e,
 			'id' => $this->get_id(),
-			'guid' => $item['guid'],
+			'guid' => urlencode($item['guid']),
 			'linktitle' => sprintf( t('View %s\'s profile @ %s'), $profile_name, ((strlen($item['author-link'])) ? $item['author-link'] : $item['url'])),
 			'olinktitle' => sprintf( t('View %s\'s profile @ %s'), $this->get_owner_name(), ((strlen($item['owner-link'])) ? $item['owner-link'] : $item['url'])),
 			'to' => t('to'),