[chirp_users] No Download from Kenwood TM-D700a

I have the Kenwood TM-D700A powered on and connected to my computer via a BlueMax49ers FTDI cable. Chirp correctly identifies the COM port confirmed as the FTDI cable in Device Manager. The Radio --> Download from Radio menu selection opens the popup with the COM port, make, and model selections all available. Clicking OK results in the FTDI lights blinking for a few seconds and then nothing. What's missing where there's no download of the radio's memory, which has most all memory slots filled with something?

Thanks, Mark AC3EW