>Hi,
>Hooray--setting sparse to .F. solved the problem. I don't really
>understand how, because logically to me it should be the other
>way around. But it calculates correctly now which is all that
>matters.
>Thanks soooooo much for the help.

Cool!

Sparse (did the help not explain it? I had to refresh my memory on that setting many times before I finally *got it*) = .T. means that the value of a column for the active row is used to populate the column for all rows. Sparse, I guess, means use sparse evaluations. Do as few as possible.

So, with sparse = .f., VFP will evaluate that value for each row as it paints the grid. It's slower than sparse = .t.