I have a question. I have a couple of columns using nested if statements
with workdays and networkdays function.

Everything works fine on my computer, but when one of my team member
recently opened it on their comp, the columns were calculating fine until
they autofiltered a column upon which they got the #Name? error and then even
when they unfilter it does not go back.

I had every one on my team install the add ins for the toolpack etc.