I'm now in my testing phase of my shopping cart. When I created a test account, I received this warning message:

Warning: Cannot modify header information - headers already sent by (output started at includes/languages/english/create_account.php:105) in includes/functions/functions_general.php on line 44

When I hit the back button, I found that my account was created successfully. I even received the confirmation email. So instead of being redirected to a "create account success" page, I got the warning message. This happened on a seconde test account. Other than that, everything worked fine.

Any ideas how to fix this or where the error might be?