Looks like you ran into same issues i had when updating to nightly8 of cm12, did u try to take a titanium backup and do a factory reset?
tapatalked from lollipopped i9300
Nope. But I'm pretty sure my problems are related to SElinux. Mine is still set to permissive, while the new kernel expects it to be enforcing.
Problems start after the kernel flash. ROM update works fine.
So I think I need to wait till updated AD sources.
Or wait till I have some more free time and do a full clean install. Manually installing all apps.