Symptom:
Mutoh Kona, OSX 10.8, not recognized (9.10)
Problem:
FTDI USB Serial Driver is a package that provides an implementation of a serial driver designed for FTDI USB devices.
Solution:
Download and install the attached USB Driver for Mac OSX version 2.2.18 (Verified to work under OSX 10.8).
For more info check: http://www.ftdichip.com/Drivers/VCP.htm