Apple has released a minor update for iTunes, v11.1.5. The new code mainly deals with a glitch related to syncing. It also, however, improves compatibility with iBooks for Mac for users of OS X Mavericks.
The update should be available now via the iTunes website, the Mac App Store, or in the case of Windows, Apple Software Update. Last month Apple released iTunes 11.1.4, which enabled Wish List access from the library, and improved support for Arabic and Hebrew.