Hi Riggs,
I had this issue as well. Is your pc, that the hardware is attached to, newer? I found I could get it to work on an older machine. I also had luck with a powered usb hub but very inconsistently. I could not get to the bottom of it and gave up. I picked up an insteon. They send/recieve x-10 just fine and you can start using insteon devices. Plus the insteon is serial...