Hi,
First, I suggest that you ensure the UDF is not stored in a module with the same name (the name of the workbook is not relevant).
If that is already the case, then I suggest at this stage you replace all the calls to your UDF with some static text. In other words replace
='c:\the path to your add-in\add-in name.xlam'!function_Name(...)
with for example
||function_Name(...)
Doing this with the Find/Replace dialog shold be simple. Then save and close the file.
Now reopen the file and replace the double pipe characters with an = symbol. Hopefully that will rectify your problem.
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