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iBooks Author 2.1.1

iBooks 3.2

iOS 7.0.4 iPad

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When I tap the search icon in one of my iBooks Author-created books, instead of the search input box appearing, I see this:

This happens whether I preview a chapter, preview the whole book, or export the book and sync it onto the device.

I've deleted iBooks on the device and reinstalled it, to no avail, and this doesn't happen with any other iBooks Author files.

Any ideas?