Symbol on Comodo icon in tray

My friend an I are both running the latest version of Comodo firewall but, on her pc, there’s a different symbol on the Comodo icon in the tray. It’s on the bottom right corner of the Comodo icon and it’s a standard symbol: white circular background, red border, red line running diagonally from top left to bottom right. Any idea what it means, why it’s there and what we need to do?