iPhoto Book Order won't go through, can't get an answer

I have been all over Apple online help, FAQs, and online discussions on this topic and have not been able to get my book to print. The problem: when in iPhoto, I hit the Buy Book button, the white envelope appears. I enter the number of copies I want and zip code, then hit Check Out and NOTHING happens.

I am using iPhoto 9.5.1. I have successfully ordered books in the past. My Apple ID is up-to-date with Express Ordering checked, and all the correct address, phone, and credit card information. In System Preference, I have checked "Remote Apple Events" in File Sharing, I have previewed the book and printed a PDF. There are no text or image issues. But I still cannot buy my book. I checked into printing through PrestoPhoto, but have no way to ensure that the PDF document I printed from iPhoto is high quality, high-resolution.

None of the discussion or help information has resolved this problem. I have no idea where to go next, or how to even properly submit this query so I get a response. Why isn't there a community for iPhoto?

Thanks in advance for anyone that can help me print my books through Apple!