An update for any of you experiencing problems after the last update to Itunes V11. Some people had asked me about various issues but comin so soon after the original release this didn’t seem so apparent. Anyway the new release 11.01 has appeared and according to Apple
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. This update also includes other important stability and performance improvements.
Not sure about the performance improvements as I thought the new release snappier especially in search than before