Make the field wider. When you get a ? on a number field, it usually means the field is too small to show all the data. You might want to include Round() otherwise the field can contain 16 decimal places.
That did it!
Thanks for your help.
You may also want to consider using data formatting on the inspector's data tab to display a rounded value while storing it unrounded. Round() does the job and I use it frequently, but if a calculation is used in subsequent calculations--especially summary or aggregat calculations that combine values from many other records, the unrounded value can be more accurate when used in those calculations. In other cases, the rounded value is the better option. It depends on the type of calculations and what the value represents.
(If you compute a dollar amount, rounding to the nearest penny is often the most accurate value, if computing a rate, percentage or a result from measurements or scientific data, the unrounded value is often the better option.)
That is a really good point, too.
Thanks for the tip.