Earlier today Apple released iOS 5.1 Beta 2 and now it have released iTunes 10.5.2 for public with few changes made. The new update includes some fixes for iTunes Match and fixed some issues regarding audio distortion.
iTunes 10.5.2 includes several improvements for iTunes Match and fixes an audio distortion problem when playing or importing certain CDs.
The update is not yet available via the Software update. You can download the update from the link below:
Download iTunes 10.5.2 From here.
The new update of iTunes 10.5.2 will soon be available via Software update. The last update made to iTunes was in November, when iTunes Match was released.