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 Releases iOS 6.1 Beta For iPad, iPhone, iPod Touch
Just hours ago Apple released iOS 6.0.1 to the public and now it appears that Apple has just released iOS 6 beta 1 to developers. This beta is for iPhones, iPads, and iPod touches , developers can also get their hands on Xcode 4.6 beta.
The title for this release has been named as Build 10B5095f.
We are getting reports that the only new feature of iOS 6.1 Beta is a new Map Kit Searches feature which is part of the Map Kit Network. This feature lets developers search for map based addresses and certain points of interest in a selected area.
We will need to wait a while for iOS 6.1 to be released to the public, as just last year iOS 5.1 was released roughly 4 months after iOS 5