Figured it out...need to replace:
<?php require(DIR_WS_INCLUDES . 'header.php'); ?>
with:
<?php require(DIR_WS_INCLUDES . 'template_top.php'); ?>
at line 173
I'm having the same issue as newtech...Overall it seems to be working correctly but the products_attributes.php page isn't loading the left menu correctly...any ideas on how to fix?