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You're right, Mike. It was light interference. (I figured it out shortly after submitting this post.) I have two light sources behind my PC at the far end of the room, about 16' away: A covered 40-watt bulb at the rear right, about 5' above the floor pointing upwards, that doesn't affect the unit. T...

I've had the TrackIR 5 for 2 days (without the TrackClipPro). Yesterday it worked fine - I didn't need to be in constant motion for it to work perfectly. Today if I don't move my head for approx 1 to 2 seconds the green light on the left goes out. It then blinks rapidly and sporadically whether or n...