HELP?

first of all, "Continue Checkout" is not taking me to Step 2

the url is staying /index.php?main_page=checkout_shipping instead of /index.php?main_page=checkout_payment

AND i'm getting a blank page.

my debug is showing me this:

[28-Jul-2009 20:55:43] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/t199shop/public_html/CATALOG/includes/languages/english/modules/shipping/flat.php:53) in /home/t199shop/public_html/CATALOG/includes/functions/functions_general.php on line 48

where line 48 is header('Location: ' . $url ); - (u probably knew that)...

this MAY have started when i "installed" the Direct Bank Deposit mod, but i'm not sure. testing this is when i noticed it...

Someone help?

thanks so much,
glenn