ToolsOptionsCalculation can be Auto or 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 MS Excel MVP

On Thu, 7 Sep 2006 09:38:02 -0700, PA wrote:

Using Excel 2002, I am set to Automatic calculation. One, and only one file
always indicates it requires Manual calculation. I am sure it is something
within the file, but am not sure what to look for. Can someone give me some
guidance on what steps to take to correct the problem.
Thanks, as always.
Paul

Gord Dibben MS Excel MVP