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
New York , Grand Central Apple Store Opens To Public [ Video ]
After the media preview of the New York Grand Central Apple store earlier in the week. Thousands turned out for the big opening. The store opened to public from 10:00AM ET , The first 4,000 customers were handed a Apple t-shirt which had Apple Store, Grand Central spelled out in the design of the train arrival board.