I just got the Windows Phone 8.1 / Lumia Cyan update for my Lumia 1520 on AT&T and I got the updated Battery Saver app. The Battery Saver medium live tile doesn't flip and doesn't show any battery information. All the other new system live tiles are working fine (Cortana, Data Sense, Storage Sense), but not this one. I was going to try uninstalling and reinstalling it, but the system won't let me uninstall it. There is no option to uninstall when I long press on the app name. I tried rebooting the phone, but the live tile still doesn't work. Anyone else having this problem?