Can you imagine how crazy you'd think the customer was if you were giving technical support and they insisted they had to do this?
After that, I don't think anything somebody reports as a Windows application bug could make me think they're crazy.
The dumbest customer will guess that a "solution" like that from support can only come from a design that sucks.
If it were a refrigerator instead of a spreadsheet it would be like support telling you that you have to keep petting the door of your refrigerator to keep it cooling.
Who is the crazy there?