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 6 Beta 4 Seeded To Developers
We have had multiple reports that Apple has realsed iOS 6 beta 4 to developers but it appears to be causing a lot of confusion among developers as it is labeled at iOS 6 beta 3 which is already been released just 3 weeks ago.
iOS 6 beta 4 is shown as Build 10A5376e , The update has appeared first via over the air and is still yet to appear on Apple’s developers center.
iOS 6 is set to be launched beside the next generation iPhone 5 on September 12th 2012
UPDATE : iOS 6 beta 4 is now available on the developers center now along side Xcode 4.5 preview 4
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