You see a cell with a formula is not blank
Replace you formula by =IF(your-formula="",NA(), your_formula)
Such as =IF(Sheet1A1="",NA(),Sheet!A1)
best wishes

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Bernard V Liengme
www.stfx.ca/people/bliengme
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>I want to graph the data from a table, but I want the charts to interpolate
> the lines inbetween the "blank" cells. All of the cells have formulas in
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> the Tools:Options:Charts: Interpolate blank cells, but I can't get it to
> work. Please help. Thanks.