My user has an 11 sheet file. Six of those sheets are charts. He has 26,097
formulas in the file. File size is 2.3 MB

Calculation is set to Automatic.

If a value is changed in a cell, the chart does NOT update. If I close and
save the file and then re-open, the chart is updated.

I do not get any Out of Memory error. In fact, I do not get any kind of
error at all. The computer I am running this file on has 2GB RAM.

Looking at Excel's specifications, I do not see any maximum number of
calcuations. While I do see a maximum number of iterations, Iteration is not
turned on, so I don't think that is an issue here.

Have I given enough clues for anyone to point me towards a cause?