Further to Alan's reply.

Common problem......not yet fixed in 2007 version.

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 Fri, 25 Apr 2008 18:22:00 -0700, mathteacher
wrote:

I have a worksheet that I use as a gradebook, and I have formulas which
calculate percentages for me. The formulas have worked all semester, but
they are suddenly not evaluating the percents when I enter a grade. Does
anyone know why formulas suddenly quit evaluating? I have a feeling it is
some setting I inadvertently changed, but I have no idea what / how this
happened.