Thanks Sue.

However, this still takes me back to my original problem then.

I publish the form to the Organisational Forms Library, I then File New
Choose Form... and select my form. I complete the active elements (the form
is made up of enabled and disabled elements, which I may simply remove) and
then send it to myself (for checking purposes).

The form arrives with the completed fields correct and I am able to add to
the newly enabled fields. However, when I click on the button...nothing.
Diddley squat. Zilch.

I can repeatedly click and nothing happens at all. I'd expect the message to
close and a new message appear (since I was the sender) but... nothing!

Why not? The Network Manager has confirmed that macros are enabled by
default and that I have full, administrative permissions on the library.