I just actually ordered and recieved 4 books from them and I think that message you are getting has to do with the PDF preview they CREATE for you.
I would try re creating the book.
As far as previewing the front and back cover it never "allowed" me to preview it until just before adding to my cart!
Hope tht helps.
You could aslo email them they are super nice and very helpful!!
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Elizabeth
Blogging for Kristin Cronin-Barrow
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