I tried what you described and it worked ok for me.

I don't have a guess why it's not working for you. Sorry.

Maybe someone can chime in with what I'm doing different???

Don wrote:

Thanks for responding Dave-
Every thumbnail has visible whitespace between the outside edge of the
photo and the gridline (I moved each manually to achieve this)
The sort range extends four couluns beyond the thumbnail column and
those columns sort correctly.
-Don

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Dave Peterson