I've got a Macbook Pro (Retina, 15-inch, Mid 2015) and a Yaesu SCU-18 cable.  My version of OS X is 10.11.5 Beta 3, but I've had issues with 10.11.4 on up through Beta 3.  

I've installed the Python Runtime from KK7DS, and chirp runs, but I can't select the driver for my cable.

I've tried a few drivers, but nothing seems to map to the /dev/cu.* 

I've tried the PL-2303HX Rev D Chipset driver, and the FTDIUSBSerialDriver_v2_3.dmg driver, but neither seem to work..  Are there other drivers/sources I can try?