On Tue, 17 Jun 2025 10:45:50 -0500, Charles Mills <[email protected]> wrote:

>Thanks all! Many GREAT suggestions. I am working on this issue and other 
>projects at the same time so it may take a couple of days for me to fully 
>pursue, but I WILL get back to you all.

Well, it looks like the worst possible outcome. The problem simply went away. 

The program runs in four "phases" of processing. I put an exit() after the 
first phase, to see if the problem was there. No error. I moved the exit to 
after the second phase. No error. Ditto the third and fourth. Then I took the 
exit out entirely (leaving the appropriate return statement) and the problem 
had disappeared. No other changes other than cleaning up some comments. I was 
testing with REGION=6M (as some suggested). Just to see if that made the 
critical difference, I went back to REGION=0M. The problem has vanished.

I don't know whether to be relieved or terrified.

I guess if it comes back I will cross that bridge when I come to it.

Thanks again,

Charles

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