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 iOS 7 GM For iPhones, iPad and iPod Touch
As expected Apple has just released the iOS 7 GM edition for iPhone, iPad and the iPod touch.
The iOS 7 GM will be the final developer release before the update is rolled out to the public on 18 September.
There is still no sign of an Over-The-Air (OTA) update for the Gold Master release, as Apple intends its developers to add the finishing touches to the iOS beta software before the impending public release.
The iOS 7 GM update is Apple’s final attempt at fixing any critical bugs and issues reported by developers through the beta-testing phase.
It is now available for download with build number 11A465 via the iOS Developer Center.