I have an issue. I'm using CPiLL's File Product module, and that seems to cause an error during the final checkout stage. I can review the order, etc., and everything else works fine. But when I click "Submit order" and the cart goes to /checkout/complete, I get a white screen.

Disabling the File Product module fixes this, so it's obvious that's where the issue lies.

The only UC hooks being implemented in the module are hook_cart_item and hook_order. This actually started happening with 7d. I didn't see anything in your release notes that would signify a large change to the way those hooks work, or anything that jumped out at me as causing the error. Any ideas?