The only difference on the label that I can find is that the older radio claims 480MHz as it's upper frequency, while the newer radio claims 520MHz.
I am using the latest 'chirp-daily-20150702-win32' daily build under windows 7 and a FTDI cable, but did try one earlier version with the same results. Any suggestions, assistance, or help would be greatly appreciated. Thank you for your time and effort.