[chirp_users] FT-60R can't upload to radio

I'm having an issue with CHIRP and my Yaesu FT-60R. I can download from the radio, but can't upload. A bit of Googling showed me that this is not an uncommon issue. Following some of the advice I found on there, I picked up an FTDI USB-Serial adapter (I was using a Prolific at first), but the issue persists. I keep getting the "Radio did not respond" error when I try to upload.

Any suggestions are greatly appreciated!

73, Matt, N0EYE