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
IOS 5 Beta 4 Is Released To Developers
Apple has released iOS 5 beta 4 to developers as well as releasing the fourth beta of iTunes 10.5 and the fourth preview of Xcode 4.2. iOS 5 brings over 200 new features including Notification Center, Newsstand, iMessage, and a few user interface features iTunes 10.5 is required to sync with this beta.
This release fixes a number of bugs and glitches and also you update this IOS from over the air as we reported in this article
If you find anything New in IOS 5 beta 4 please let us know on twitter or Facebook or email admin@MacReviews.com
We have FULL Coverage of the iPhone 5 Live Event and other Apple events Here and on Youtube