So with the latest build, there is a couple of weird things. The back arrow doesn't work on the start screen to show all the windows that are open. It does work in the apps though. Second thing is double tap won't wake phone, neither will power button. I have to hold power button till the close screen comes up, then slide up. I also can't exit out of start screen, have to let it time out. Very odd. Smooth as silk other than that.