Norton Ghost ALWAYS says "At Risk"

I have used Ghost forever and it has alway worked great and been simple. Now I am using 15.0.1.36526 on Windows 7 32 bit SP1. The backups go to an external WD RAID unit, I don't recall the model but it has twin 2TB drives in a mirrored array.

 

I have a single drive (C:) in my machine and a single backup job that always runs at lunch. No problems there.

 

But Ghost ALWAYS says "At Risk" (systray icon and Ghost Home screen) so I always have to open Ghost and manually check... was there a problem with todays backup???

 

I occassionally have an external drive that I plug in from time to time.

 

On the status screen I see a table with the C: drive and the BU jobs by day. I also see the WD BU unit listed as [My Book 2x2TB] (F:) listed with an X in a red hexagon.

 

On the advanced screen I see my C: drive with a green circle and check, 2 other C: drives with questions marks, System Reserved (D:\) with question mark, (E:\) with question mark and the [My Book 2x2TB] (F:) listed with an X in a red hexagon.

 

All I care about is the first C: drive in this list. What do I need to do to make the "At Risk" condition go away without risking deleting my backups.?