It looks like we're already working with you both via our support Live Chat and email, so we'll just continue the discussion there. Here was our reply in case anyone else happens across this thread:
This appears to have been a temporary glitch with Credit Card checkouts for sellers using PayPal Payments Pro, which our Devs have since resolved. Buyers should now be able to complete Credit Card payments as expected. Thank you for your patience with our apologies for the brief disruption.
