I made the changes you said:
This: $WA_Store_Cart->redirStr = "cart.php";
is not in the checkout_success.php page
But after replacing the file with the originals, and making all the changes below (except for the above mentioned change), all works fine except I'm not getting any email confirmations.
When I start the Checkout procedure, and I'm at the page that says" Your Shopping Cart", the address is: cart.php. When I Submit the Order from the confirm.php page, it takes me to: checkout_success.php. So the order is processing fine now...I'm just not getting any email notifications, which I was before I made the changes.