Aura HD - can't place order?

I decided to order another Aura HD. First with Chrome, I get a "redirect loop" error. Then with IE, I'm able to get to the checkout page, but clicking "place order now", it just spins forever. Tried again with Firefox, same as with IE.

I know my card has not been charged since I can check that right away.

My order for the first Aura HD went through about 3 weeks ago, and I recently bought an ebook, so this is a new problem.