The recent Xbox Live Dashboard update was heralded as a boon amongst users, but unfortunately for some of you, the new version didn't just come bearing gifts. A number of people are experiencing an issue, more commonly known as errors "801540B7" or "80070571," that's keeping them from getting their daily media fix by booting them from the Live network and locking its purchased-content doors. Microsoft's aware of the symptoms and it knows you've got lots of online appointments to wax chumps and smoke fools, so it's told the folks at Joystiq that a solution is in the wo