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
Minecraft 1.0 Released at MineCon –
Today Markus Persson become centre stage at MinCon to remove the “Beta” From Mincraft which is most defiantly his most popular game. Persson received a very warm welcome at MinCon as he took centre stage at the sold out event. You should be receiving an update message soon.