I upgraded yesterday to 10586.63 on my Dell Venue 8 Pro. And I did not encountered any problems. So I let it be for the night on charging. This morning the screen was black and the only thing I can do is shut it down. But it does not really shut down (the usual way by sliding downwards) because when you press the on off button the same message comes again. Power button plus volume down do not give a different result. Is it in an upgrade mode and I don't see it or is it something else? A Bug? Do others have the same problem?:unhappy: