SD sannot find target Volume problem

[braeside]

I have two user settings saved, I am calling them by means of a pair of Applescripts, in the way that others have described.
However I sometimes have a problem where SD starts and tries to find a volume that I have not specified in that particular setting and because the volume it is looking for is not there it comes up with a dialog box which I can dismiss and then it continues fine with my settings and does the backup.
This is a minor irritation when I use the script manually, but no good if I want to schedule it automatically as the it never dismisses the dialog.
Is there some way to stop SD from trying to mount volumes when it starts (ie get it to forget them from the last time it was run)?
I hope I have been clear enough...
Many thanks

-- David