To answer the "I wonder" question.

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 Wed, 1 Nov 2006 12:04:02 -0800, Angel
wrote:

I had the same thing happen to me. Strange? Anyways, the fix to auto
calculation worked for me. I wonder how it change by itself. weird.

Gord Dibben MS Excel MVP