@SetField not working for some users

I have a simple form with four fields: form, from, to and enabled (all text fields, no readers or authors.) In the view, I have an action whose formula is: @SetField(“Enable”;“N”) It works on my workstation (8.5.1FP4) but not on someone else’s (also 8.5.1, but not sure of the FP level.) No errors, it just doesn’t do anything, yet she can open the document, change the field and save it. (She’s a member of a group with Editor rights) Any suggestions?