When I attempt to check out or view cart, I get your generic error page:
"You’ve reached this page due to an error on paizo.com. The web team has been notified and are working to fix the issue.
"Click here to return to paizo.com"
It does not appear to be just me, from other messages today. But, if it helps, the one item in my cart is the brand spanking new Eyes of Empty death pdf.