ToolsOptionsCalculation. Set it to Automatic.

The how it got changed part................

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 Tue, 14 Oct 2008 17:04:01 -0700, Jason D. Miller <Jason D.
wrote:

I have a complex spreadsheet - that just started acting up.

Multiple colums utilize sum () feature. The problem is that the cells that
utilize this information as part of a formula do not update until I hit save
and close - then the fields are updated.

Any clue? I did not change any settings - spreadsheets from the past that
once worked; now do have the same issue occur.

Please Help!