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Are you exporting as Spreads?
"Don't do that." Best practice is generally to let the PDF viewer do that, by choosing View as Spreads (or whatever). Because many users will not want to view your PDF as spreads, depending on their monitor geometries...
I have been exporting as spreads. It's my understanding that the PDF will not print out spreads if the pages aren't sucked in that way, even if properties have been assigned to view "two-up." My client insists on viewing as spreads and wants to print them out as well, and given the design of the book, I can understand.
Is this a bug in the book file algorithm that is corrected in CS5?
A bug? No, since it is "as designed."
If your clients insist on seeing spreads and printing them, you need to do some extra work. Export the book as single pages, then set up a NEW facing pages doc and use Scott Zanelli's script to place the pdf int that (InDesignSecrets » Blog Archive » Zanelli Releases MultiPageImporter for Importing both PDF and INDD Files) and export THAT file to PDF as spreads (which will work as you want since you are now dealing with a single document).