Hi again Don,

I know you said it is non-consequential, but it still intrigues me that the
opening problem has moved to the new sheet.

Could it be a function that is volatile (like now() or today()) or
a macro that is still active when you save, so that it is the last thing to
be saved?

Copying and pasting by small increments would help to isolate
the rogue cell(s), if that is the case.

Or, like you say, we can just do a 'Ned Kelly' and say 'Such is Life"

Regards
Martin