Ghost 15 "Status: At Risk"

I have Windows 7 Professional 64 bit. On start-up the Ghost icon in the task bar has an X on it and says "status: at risk", but if I open Ghost it changes at once to "Status: Backed Up"

How can I resolve this so that I can rely on the task bar icon status.  Exactly the same thing happened with Ghost 14 and Windows XP sp3!!!!!