My fundamental problem was that I didn't actually have one of the Brief emulations selected. It's not at all intuitive (to me) that one has to press the 'Active' button to select the highlighted emulation. The 'home-home' and 'home-home-home' key combinations now work as expected. I have also ...

Two issues (version 3.97u):
a - 'home-home' and 'home-home-home' don't work ('end-end' and 'end-end-end' do work).
b - numeric keypad 5 working incorrectly: it moves just the cursor to the vertical center of the window (thus moving the cursor to a different line), should scroll window contents so ...