Broadcom Crystal HD card BCM70015

I installed Crystal HD through Maintenance --> Install Extras menu. Installed drivers through nitoTV --> Settings --> Utilities --> Kernel Extension Manager and added drivers to rc.local as per instructions. In XBMC under video --> playback ‘Allow hardware acceleration (CrystalHD)’ option is selected. So far so good. When I reboot or restart apple TV the above settings are gone. In XBMC under video --> playback the ‘Allow hardware acceleration (CrystalHD)’ option is not showing. In order for it to show again I have to repeat the process all over again. Is this normal?