Thanks, but for my OSCommerce version the billing address is NOT:
<?php echo tep_address_format($order->customer['format_id'], $order->customer, 1, '', '<br>'); ?>
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It is:
<?php echo tep_address_format($order->billing['format_id'], $order->billing, 1, '', '<br>'); ?>
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I had to replace the two instances of the word "customer" with the word "billing" on each of the following files:
admin/invoice.php
admin/packingslip.php
account_history_info.php
print_my_invoice.php
I am puzzled why other users have not been affected.
Thanks again for a nice contribution.