I assumed that since you were selling it that it would work so I just bought it. As a matter of personal policy, I like to pay the developer for a good product. I am running windows 7 with taranis x9d plus and a usb cable.
I understand, and I appreciate that. Well, sometimes it helps to update your graphics and sound card drivers to the latest version. You can also try running the simulator in a window as described in the manual and see if that makes any difference.
