Believe the calculation mode of each Excel session
is dictated by the calc mode of the first book opened
within the session.
For example, if the first book's calculation mode is "Manual",
then the mode for all subsequent books opened in the same
Excel session (i.e. until / unless Excel is exited) will
be "Manual", irregardless of their earlier saved modes.
If you're wondering how it got switched to "manual"......
Excel takes the Calculation mode each session from the settings on the first
workbook opened in that session.
i.e. If you saved Book1 with calc mode in manual and opened it first, calc
mode would be in Manual.
If you saved Book2 with calc mode in auto and opened it after Book1, Book2
would be in manual mode(Excel ignores the auto calc mode in this case).
If you close Book1 before opening Book2, Book2 will be in auto calc mode.
Confusing enough? <g>
Gord Dibben Excel MVP
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