Apple recently released their major update to iTunes, iTunes 11 and now Apple has released a small update to the software for both Mac and Windows in the form of iTunes 11.01.
The iTunes 11.01 brings a number of bug fixes related to iCloud, plus a big fix for AirPlay, Apple has also made the app faster when searching through a large library.
This update to the new iTunes addresses an issue where new purchases in iCloud may not appear in your library if iTunes Match is turned on, makes iTunes more responsive when searching a large library, fixes a problem where the AirPlay button may not appear as expected, and adds the ability to display duplicate items within your library.
You can find out more details about the iTunes 11.01 update over at Apple.
Source MacRumors