Autoleveller

thanks for your comment.

Until recently it was not a problem?
I understand your story not entirely

I have X in the middle because these are my reference holes
So I very silmpel flip the board on the middle of X.
For a double-sided board.

A few days back it was no problem
to use coppercam files so.

Even older files now make mistakes.

Another problem is that autoleveler always think my reference hols
to be part of the milling area.

Sorry maybe I should think and work differently.
But I can not change Coppercam and work well and fast for me.

Or maybe I should not use autoleveler longer
And do it the old convetioneele Bungard way.

Maybe you have another idea.

Thanks so far Clenn

I do have one idea which may help...

Try changing the X, Y, X length and Y length manually so that you cover the milling area in your gcode, something like this:
This got rid of the NaNs but you may need to check the output to make sure it looks right.