Is there a bug when placing a token inside quotation marks in CiviMail 4.6.2+?
in CiviCRM 4.6.2 you can patch this issue with the following edit:

--- a/a/civicrm-core/CRM/Mailing/BAO/Mailing.php
+++ b/b/civicrm-core/CRM/Mailing/BAO/Mailing.php
@@ -1472,7 +1472,7 @@ ORDER BY   civicrm_email.is_bulkmail DESC
       if ($this-&gt;url_tracking) {
         $data = CRM_Mailing_BAO_TrackableURL::getTrackerURL($token, $this-&gt;id, $event_queue_id);
         if (!empty($html)) {
-          $data = htmlentities($data);
+          $data = htmlentities($data, ENT_NOQUOTES);
         }
       }
       else {