Apple has released iTunes 11.1.3 for download, which addresses a bug with the equalizer, improves performance when switching views in large libraries and additional bug fixes. If your current version of iTunes has been acting up, this update is recommended.

You can download the update by going to Apple > Software Update on your Mac, or navigate to the Updates tab in the Mac App Store.

iTunes 11.1.2 was released on October 22, which brought support for OS X Mavericks.