There are some formulas with mixed internal classes that Spreadsheet::WriteExcel doesn't parse correctly. The effect is as you describe; Excel doesn't calculate the formula correctly until it is forced to. This is a known issue.

If you post a small working example to the Spreadsheet::WriteExcel Google Group I can suggest a workaround.

--
John.

In reply to Re: Spreadsheet::WriteExcel formula confusion by jmcnamara
in thread Spreadsheet::WriteExcel formula confusion by Anonymous Monk

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