Coworker comes to my desk today. She's in the "usage" half of the Support department.
She describes the situation. Customer has a client file that, when accessing a certain window, isn't displaying expected options to change certain dates.
So I poke around for 2 minutes, find a certain setting that determines what type of client file return it is.
I say to coworker, "Is it because it's this type of return?"
She says no
I go to my desk with a copy of the client's data, change the return type, and wallah, that previous date window is now working correctly.
So I take one of the sample client files, change it to match the return type of the customer, and waddyaknow, the date window doesn't work. I change it back, and now it works.
I go back to coworker's desk and say "it's cuz the return is this type of return" and she says "no, you're wrong."