Hey there, I had the same problem with you. And went through some head scratch time. I accidentally changed the Notification Option by ticking the "Show Messages from Windows Security Center". Then the big cross on the Norton Protection Center icon in the system tray just suddenly gone, by that time I suspect once I change it back, the big cross will come back again. Surprisingly enough, the green tick stays put. So I guess my problem is solved. You can have a go.