Martin, sounds like a preferences confusion
Trash the preferences (Applications > Leaf Capture 11.4.5 > Utilities > Double click on Reset Preferences)
Launch the software and go to Camera Configuration
From the first drop menu select Leaf AFi-II 12 (it's the last one)
From the 2nd drop menu select Leaf AFi
Connect the back as you do normally and go to work
Regarding the BJP report the tethered test took place over Christmas and the was no trouble shooting done at the time. I have an old 17" G4 1.67Ghz which works albeit very slowly...
If someone has issues connecting to a laptop we recommend using a powered hub
Hope this helps
Yair