Tom has shared a Google Sheet with Dick and Harry. Dick is geographically within the same building. Harry is about 30km away to the East. Tom is the "Owner" of the script, Dick and Harry have "Editor" access.
Dick is able not only to edit the spreadsheet but also to select items from the user-defined menu and run user-defined code. Dick has been doing so for some weeks.
Harry was given access today. He was only able to access the menu after the programmer had explicitly created an onOpen Trigger to execute the Google Sheet's onOpen function. Harry still can't run the user-defined code from the user-defined menu.
Why is Harry struggling?
-- Bruce