You say that you are running Zen Cart 1.3.7 but not which version of the addon you are running.
Also do any of that long list of addons that you have also change any of the following files:
* admin/orders.php
* admin/includes/stylesheet.css
* includes/classes/order.php
* includes/functions/functions_lookups.php
* includes/modules/pages/checkout_shipping/header_php.php
* includes/modules/pages/shopping_cart/header_php.php
If so, did you merge both sets of changes into the core Zen Cart, or overwite one set with another?
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