I had this issue with my customer earlier, "Whoops we hit a snag loading your data" when he was trying to pay for Turbotax with his credit card. This error turned out to be due to a non-US address being in the return. In my customer's case the credit card (cc) address was US, but the address in My Info was not.
We resolved the issue by temporarily changing the address that was not a US address in the My Info section to the same US address that was on the CC, JUST UNTIL the payment was processed. The then customer went back and changed the My Info address back to the non-US address, after his payment was successfully processed. Hope this helps somebody.
