Okay... so email from the client last night. Looks like we've gotten to the bottom of this.
Seems that they hadn't waited for iBooks to finish indexig the book before looking at it. I know that you sometimes can't turn to later pages while it's doing whatever it does when you first load a book, but also appears to affect bits partway through as well.
So, ultimately not an issue. But not a brilliant customer expeience if you've bought the book.
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