Nor do I.



Any other clues?

e.g.
Size of file? Complexity of calculation? Array formulae? Speed of
recalculation? Can you open it and it later locks? What precedes it
locking? Do you have an earlier version that doesn't lock? Latest
changes made before lockups occurred?
What's your strategy if you can't get this file working? Does it work
on another PC (perhaps a newer one)? etc


--
John James
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