Ghost 15 Recovery Point Set option not available.

I'm using Ghost 15 running XP SP3 on a Lenovo laptop in a Docking Station.  I have the C:\ drive and two external USB drives, E:\ and J:\. 

 

E:\ is used for data.  J:\ is the Destination Drive for all backups.   I have been backing up C:\ and E:\ to J:\.  Everything was fine until I started attaching and removing a smaller USB drive for temporary storage.  Drive Letter E:\ became F:\.  So I missed a few days backup.

 

I defined a new backup job for F:\ and at the same time changed some Destination Directory names.  To clean things up, I manually deleted all of the Recovery Point Sets for E:\ and the Backup job that pointed to E:\.. 

 

Now when I try to define a New Backup job for F:\, the only option available is Independent Recovery Point. 

 

 Ghost says:   You can only have one recovery point set defined for each drive. The Recovery Point Set option is not available if you have already assigned a selected drive to an existing backup and specified Recovery Point Set as the recovery point type.

 

How can I get back to doing Incremental backups for F:\ ?

 

The C:\ backups are working fine and I would prefer not to blow the C:\ Recovery Point Sets away and start over.

 

Thanks for any help you can provide.