Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
iTunes and iPhone Updates
Today sees two important upgrades in preparation for the Apple iPad device. The first update is to iTunes 9.0.3 providing a number of important bug fixes, including, iTunes no longer ignores your “Remember password for purchases” setting, Addresses problems with syncing some Smart Playlists and Podcasts with iPod, Resolves a problem recognizing when iPod is connected and the update also addresses issues that affect stability and performance.
As well as bug fixes iTunes 9 also comes with many new features and improvements, including an improved look and feel, including a new Column Browser for easily browsing your artists or albums, movies, TV shows, and more. In addition the iTunes Store has a brand new look, with improved navigation for quick and easy exploration.
The second update is for the iPhone / iPod Touch to 3.1.3 improving the battery level indicator on the iPhone 3GS, resolves issues with some 3rd party application and finally fixes a bug that causes the device to crash when loading the Japanese keyboard.
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