No paypal hasn't changed anything that should effect you. She may be using bad credit card or date syntax. You would have to add debug code to the failure page to find out more. 
Error Messages:
Fatal error: Call to undefined function PP_DirectPayment_Result() in /usr/www/users/lhunter/checkout_failure.php on line 145
This error is on the failure page, should I put the error check on the confirm page?


