I posted a question (which I have since solved) on a different forum.
I have a model that uses some advanced date functions found in the ATP.
My worksheet includes some VBA code but primarily for sorting and
printing. Nothing in the code references any functions.

On computers that didn't have ATP - VBA installed, the model would
create a warning about links and then show an error message for certain
formulas stating the Name was not understood.

I've solved the problem by including a VBA statement that loads both
ATP addins when the worksheet is opened.

However, I don't understand why ATP - VBA is needed if I don't have any
functions called via VBA.

Thanks.

- John