Okay. It looks like you will also have to edit line 91 in the admin/tracker.php

Replace:
Code:
<a href=" . CARRIER_LINK_1 . $track_id1 . ">Click here</a>
with:
Code:
<a href=" . CARRIER_LINK_1 . $track_id1 . "&xslURL=/xsl/pactrack/standard.xsl" . ">Click here</a>