Somehow my backup got corrupt as well so flashing back didn't work.
full wiped, flashed .27 set pin lock, locked phone and it says wrong pin entered, re flashing again now, so don't set a pin lock on this version, you won't be able to get back in.
Sent from my Nexus 7 using Tapatalk 2
Any app requesting root permissions when enable root is turned on causes a hang and reboot, going into manage root and allowing the app after it reboots allows the app to run fine however.
With enable root off the system correctly warns that it needs to be turned on to allow permissions...