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A work around has been identified.
Are you going to let us know what that is? I never got started using spread sheets since databases were so much easier to set up and display data. So, I have very little experience with Numbers and absolutely none with Excel, except for those that have been sent to me. And, even those, I open in FileMaker!

But I am a little surprised that Numbers can use Excel macro's.

I'm sure that will be great for many users. Still, Numbers has many fewer capabilities than Excel and many have no choice other than Open|Libra|Office.