The "file 5 Set Workspace…" is adding Set Workspace to the bottom of the File menu. But all this works as desired. It’s only when I attempt to add a new menu title that it gives me that error and doesn’t save my preferences.
Could you explain what you mean by "specify the argument 5 in the menubar object"?
*EDIT* Sorry, I understand now. The menubar object requires an INT argument to signify the number of menu title outlets if more than the standard 4 are desired.
I realised this IS listed in the help file, however it’s explained only within the argument description for the argument listed as "display".