There is a thread on here about a related problem ... related to the power saving feature in windows ... which turns off your USB port after a certain amount of time. And that forces you to re-plug it in before it will work again. I believe the symptom is the right light going off after a while. The fix is to change the power saving settings to disable the USB power-off, which is on by default, at least in Windows 7. Again, they is probably not your problem, since your getting the red light and just not the green. Send some signals to the dongle from sequencing software and see if your green light blinks.