Ever since Beta 3 I have been having an issue where every time I enable iTunes Match, it deletes my entire library. If I enable Match, then have "Show All Music" turned to off, then go into the music app; it'll have a little cloud icon and a loading bar. After the loading bar is done it just says "No Music" indicating that all the music is gone. When I have "Show All Music" enabled, it'll of course show my entire iTunes Match library, and when I play a song it'll stream it then download it. Then if I disable and reenable iTunes Match, it'll delete the downloaded songs. The music never disappears in iTunes when I view the music on my iPhone. I'm just wondering if this is a rare issue, or if Apple is changing iTunes Match to do that on purpose. If it's the latter, that might shy me away from iOS 6. If anybody has had this issue, were you able to solve it?