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
Apple release OSX Lion 10.7.1
Apple released there latest update to Mac OSX lion (10.7.1) to there public today. If you have been finding a lot of bugs and having a lot of problems with OSX Lion then we advise you to upgrade as soon as possible.
A lot of people have tried to upgrade Lion from the Mac App Store but to upgrade you have to use Software Update.
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