The first thing I would try if I were you is to try both a default model file and a model file with the offset described in the Frsky setup document:
https://drive.google.com/file/d/0BwSDHIR7yDwSOGhPMTFyWEpDVWM/view?usp=sharing
That way you should be able to figure out if the cause is the model setup itself.
If you are suspecting the problem might be an update of the Taranis drivers you can check this post for clues:
https://oscarliang.com/opentx-usb-joystick-mass-storage/
If it was working before and an automatic Windows update caused it to stop working I can suspect that it has something to do with your systems USB input/joystick drivers.