I have a similar problem but with different error messages - I hope you can help me out Rod:

Warning: file() [function.file]: URL file-access is disabled in the server configuration in /home/.ruchi/screampix/screampix.com/twoc/includes/modules/shipping/austpost.php on line 88

Warning: file(http://drc.edeliver.com.au/ratecalc....100&Quantity=1) [function.file]: failed to open stream: no suitable wrapper could be found in /home/.ruchi/screampix/screampix.com/twoc/includes/modules/shipping/austpost.php on line 88

Warning: Invalid argument supplied for foreach() in /home/.ruchi/screampix/screampix.com/twoc/includes/modules/shipping/austpost.php on line 89

Warning: file() [function.file]: URL file-access is disabled in the server configuration in /home/.ruchi/screampix/screampix.com/twoc/includes/modules/shipping/austpost.php on line 122

Warning: file(http://drc.edeliver.com.au/ratecalc....100&Quantity=1) [function.file]: failed to open stream: no suitable wrapper could be found in /home/.ruchi/screampix/screampix.com/twoc/includes/modules/shipping/austpost.php on line 122

Warning: Invalid argument supplied for foreach() in /home/.ruchi/screampix/screampix.com/twoc/includes/modules/shipping/austpost.php on line 123

Cheers,

Nicki (total zen-cart newb but getting there...)