Thanks to all who responded. I tried everything in the "Quick Guide to Shelf Management" and so far it works like a charm! I added a few new books and they all appeared in the correct collection on my Aura HD.
I assume that I can now go back into calibre and place all the remaining books in the various collections by using the My Shelves column that I created??
Thanks again--this is going to turn out to be a lifesaver. I just hope subsequent upgrades don't trash the collections all over again.
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