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
Mac 10.7.1 Hits the Mac App Store
Last week we reported the release of the Mac OS 10.7.1 update. Apple has today (Wednesday 24th August) updated Lion and the roughly 4GB installer to 10.7.1 on the Mac App Store. Apple will most likely carry on with this workflow were there release the update through software update then a few days later release it in the Mac App Store.
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