Thanks, Paul, I've done that but I confess I haven't been consistent. Now I'm paying the price!
What's curious is that if I process a tiff file with QTR, I can look at the layer palette and see very plainly the layer containing GG-to-QTR.tiff, but cannot see it in a jpg that i've processed.
Anyway I'll label my files more carefully from now on.
Regards,
Paul W.