Zen Cart 1.3.9f
PHP Version: 5.2.14

I am trying to get a successful checkout using the check/money order module. At order confirmation we are getting a blank page.

I am receiving the order notification email and the orders are showing up in admin.

I changed templates back to the default green and the issue is still happening.

I removed and reinstalled the money order module but that didn't help.

Checkout with cod is working ok.

debug shows this error

[01-Nov-2010 18:34:20] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/content/xx/xxxxxxx/html/store/includes/languages/english/modules/payment/moneyorder.php:53) in /home/content/xx/xxxxxxx/html/store/includes/functions/functions_general.php on line 45