N360 taskbar icon changed

Ok,

As title says, today, on one W7 x64 system the N360 systray icon displays the number 1 with a blue circle. (unread message).

I open unread messages, N360 displays a blank window. I go to my Norton account everything seems ok, no unread messages.

How to make the number 1 go away and having back the green ok N360 systray icon?? Reboot does not help.

It's similar to this topic: Unread Messages - Message Center | Norton Community BUT in my case I can connect to my account via N360 GUI.

Any suggestions are welcome.

Thank you.