LBE Privacy Guard is a great first app to install on your fresh Android device but the Active Protection feature currently conflicts with something in Android 4.1.1; looks like a screen-sleep loop or reboot loop until you find a way to uninstall LBE or disable Active Protection remotely (for me, that was another fresh firmware install to regain control).

4.1.1 is looking pretty good otherwise so far but we'll have to see how it holds up over time now that the researchers can start beating on it.