I've honestly tried to read through the messages on here, I could have missed it - but don't think so.
I've got a WEIRD problem.
Everything is installed correctly.
When checking out, if I enter the the coupon code it correctly takes me to checkout_confirmation.php. If I enter the wrong code, it tells me that too.
BUT - If I don't enter a code at all... it pulls up the checkout_confirmation.php page as blank (an HTTP 500 error).
Has anyone encountered this or have any tips? I am completely stumped.
Thanks!