can't manage offsite destination with ghost 14

I have offsite backup enabled to a USB drive with an alias assigned to that drive (XP SP3).

 

The drive is full. I wanted to use manage backup destinations to remove older recovery sets.

 

Ghost detects the drive, shows it is full, but doesn't show that there are any recovery sets. I can use windows explorer to see the recovery sets on the drive.

 

Do I have to delete these old sets manually? I would be surprised. I think Ghost is not detecting these sets for some reason.

 

Thanks,