Wacom PenPartner and TabletMagic

I've been trying to set up a Wacom PenPartner on Mac OS X using the
TabletMagic preference pane. I've set up 2.0 beta 6, and it almost
works - except the pressure value flipflops between 0 and 255 rapidly
and the button presses fluctuate wildly between button 1, button 2, and
button 3 (all clicked one after another in random fashion).

This means while I can move the pen across the screen fine, the pointer
is wildly clicking on everything it reaches. Unpleasant, to say the
least.

Can anyone help?

Mac OS X Tiger (10.4.6)
PenPartner (CT-0405-R)
(recognized by TabletMagic as: CT-0045R00 (PenPartner) 1.3)
TabletMagic 2.0 beta 6

David