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
Tim Cook says Jony Ive's Redesigned iOS 7 Coming At WWDC
It has now finally been confirmed that Sir Jony Ive is taking a leading role in iOS 7. Apple CEO confirmed the that Ive was really key to the redesign on the refresh of iOS which we will see in a couple of weeks time at WWDC 2013
So talk to us about the new iOS.
Remember what it was like on Christmas Eve?
No, we opened our presents on Christmas Eve.
And I’m Jewish. But this is what Jony Ive has been working on?
Yes. Last fall we changed things up, to really ramp up our innovation. The key in the post-PC era is to have incredible hardware, software, and services, and to combine them so you can’t tell what’s what. The magic is at the intersection. So we amped it up. We recognized Jony’s contributions to the look and feel of Apple over the years, and that he could do it for software too.
As expected Cook refused to comment on any specifics of iOS 7 but did confirm it will be shown of at WWDC along side Mac OS X 10.9