I'm with you Wayne! I'm going through something similar. In my case, I have 2 NooElec dongles that work well with RTL1090 and ADSB SCOPE but NOT with SDR#. It's weird. I have the latest version installed, and the old version uninstalled. I keep getting errors telling me that the "device" has rejected all attempted communications from the program. I have reinstalled the driver, taken out and reinstalled Zadig, nothing! I don't get it!I was hoping it was a new one - it's two years old - with helpful info but about all it does is confirm you can run more than one. Many of us are doing that now. What I'd like to see is information on how to properly identify them. I have issues sometimes keeping them associated in SDR#. It seems like SDR# goes by USB port so you mess with that and you're plugging and pulling until you find the right one.