I installed this as well after removing the previous version as suggested. If I plug in the Powermate after installing, or after rebooting it will work until I open another program. If does not work in the second application opened, and from that point no longer works in the original program, or any other opened programs. I note that the installation package installs only a prefpane, whereas most drivers (and the orginal 1.6.4 version) install an extension and then require a reboot. Does this version not require the driver kext file, or is there an error in this installer?

In any case, back to 1.6.4 which works.