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 & iCloud Launch Nearly Here After Apple start training employees –
9to5Mac recently reported that they had heard from a source that Apple has begun iOS 5 and iCloud training with in store employees. According to there sources, training is done through a new section inside of the company’s recently released internal RetailMe application.
In recent events Apple Stores have began training their staff of new software in the couple of weeks leading up to a respective product launch , This is not saying this is the cases this time. Not only are Apple Store employees started for being trained on IOS 5 but have also have also begun receiving detailed information on Apple’s upcoming iCloud service. You wouldn’t expect any different after Apple announced they would release them at the same time ( Some time in the fall) , but a lot of IOS 5 features are based around the iCloud