Starting yesterday, I haven't been able to drag the notification bar down from the top of the screen with the stock ROM. I can bring it down with the option key -> notifications, and I can drag it back up, but not back down once it is closed. That part of the touch screen works fine in other applications when the bar is hidden. I don't think I changed anything to prevent it from working. Is there some setting that I'm missing? I've already tried restarting the phone.