I use the wouxun and commander programs on the PC
Okay, it may be worth trying chirp on Windows, if you can, just to rule out any issues with the driver on MacOS.
Part of the problem is that the chinese manufacturers regularly make multiple versions of the "same" radio that speak a different language or have subtle differences with no visual markings to distinguish them. If it doesn't work on Windows, then that may be biting us here.
Also, if you could get and send the debug.log from the Mac, that will help us determine if it's not seeing any data from the radio, or if something more detailed is going on.
Instructions for getting your debug log are here:
http://chirp.danplanet.com/projects/chirp/wiki/How_To_Report_Issues
I assume you're using 0.2.0?