Will not autostart on Mac

I'm running Mac OS 10.9.1 and I'm trying to have Norton Zone startup when I startup/login.

 

"Start Norton Zone on system startup" is checked, yet it will not start up. I've tried adding Norton Zone to my login items and it will startup as required on startup, but it will remove itself from my login items and not startup on the next startup. Am I being stupid or is this a bug?

 

Thanks.