None

developer doesn't really know or care about corner cases and as a result it's possible for the GUI to show "green" when in fact there is actually a problem that could be detected. That said, if you've used zadig to install the driver then it should indeed work. What do you mean by instance here again? Sorry if you already mentioned that. If the device has multiple interfaces (a so-called composite device) it is important to install WinUSB for the actual device, and not for either of the two interfaces. I don't know how your .exe files were built and if they are using libusb or the hostile fork libusbx which clobbers the soname and uses the same API namespace, the latter driven by that same zadig/libwdi developer. I know the actual libusb very well and it would be interesting to see output from a debug build of my current working directory with libusb source. I've built a binary using the MS C compiler here: http://stuge.se/libusb-1.0.dll Try putting this in the same directory as the program and see if you still have the same problem. Even if the program was built using MinGW that DLL should work well. If yes, the output from the program would be interesting. Thanks //Peter