Excel takes it's calculation state from the first workbook you open after
launching an Excel session. It may be that your personal.xls, or a timesheet
file you use every day that launches automatically has been saved whilst in
manual mode. Find and fix.
RD
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Please keep all correspondence within the Group, so all may benefit!
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Under Tools->Options->Calculation the option for "manual" keeps being
reverted to, even though I never change it.