Apple released another minor for iTunes today, bringing the version up to 11.1.3. The update includes a fix for a bug affecting the equalizer, as well as a tweak that improves how iTunes handles large libraries.
From the release notes (via 9to5Mac):
This version of iTunes resolves an issue where the equalizer may not work as expected and improves performance when switching views in large iTunes libraries. This update also includes additional minor bug fixes.
Note: If you are using OS X Mavericks, your book library can now be found in iBooks for Mac.
The update is now available in the Mac App Store via Software Update. It’s not currently available on Apple’s iTunes download site – but we’ll let you know once we see it appear now. The update weighs in at 230MB.