I've been experiencing an issue with the regular TrackClip which does not occur with the TrackClip Pro. When yawing, TrackIR detects pitch as well, when I am in fact not changing my pitch. Here is an image with an example of the movement pattern when yawing left/right:
Like I said, the problem doesn't happen with the TrackClip Pro. While I could simply use the TrackClip Pro, I would rather use the TrackClip as it's more convenient for me.