Due to SELinux changes, you _have_ to relabel your data-partition on
the first boot of a ROM built after 2014-01-17. This only needs to be
done once.
To do this, enable adb/usb debugging  and grant root to adb (both in
developer settings) and execute via an adb shell:

su -c 'for i in /data/*; do echo "${i}"; restorecon -DFrv "${i}"; done; sync; reboot'