Prolific driver for OS-X Mountain Lion 32 and 64 bit installed correctly. Verified using:

ioreg -c IOSerialBSDClient | grep usb and kextstat | grep usb

port appears in /dev as cu.usbserial

device shows up in networking as cu.usbserial

device shows up in chirp as USB-Serial (name I gave it.)

When I read from the radio the read (clone) dialog box appears but no data is received, the green light on the radio doesn't blink and then after a few seconds a dialog box stating communication error appears.

Anything I'm missing?

Sent from my 15.4" MacBook Pro, i7 quad core