On Tue, 18 Dec 2018, Bruce Vining wrote:

I suspect the key is "moved the local declarations back into the main
procedure".

And Jon wrote:

Unless declared as STATIC all variables within a subprocedure are dynamic and basically go away as soon as >the subprocedure returns. I'm guessing this is the root cause of your problem.

I believe we have a winner here. I've not got it completely debugged yet, but the use of "static" local declarations changed the behavior of the procedure quite a bit. So, it boils down to what's germane to the procedure and what isn't.

Thank you all; I knew it would be something I should already know!

--Buzz


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