Hello Mike,

I would like to know whether you have loaded the Add-in and if you type the
function in your cell, did the function works?

Please let me know whether these KB article is helpful

Excel fails when Automation add-In loads
http://support.microsoft.com/kb/284876/

Excel COM add-ins and Automation add-ins
http://support.microsoft.com/kb/291392

Sincerely,

Wei Lu

Microsoft Online Community Support

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