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Recently, my TrackIR 5 has started showing the image on screen jumping around every few seconds.  This happens with the TrackClip and a IR head tracker.  It happens when I am just running NaturalPoint software, so it is not related to any games, etc..
I have tried reinstalling the software, and changing the USB port, but to no avail.  I have also tried in dark rooms, light rooms, etc., but again, no luck.
Anyone have any ideas on this?

Unfortunately I don't have a solution yet, but wanted to say that I too have just started experiencing the same general issue. In the TrackIR application, pressing F12 often results in no response; if it does center, itself then the application either goes dead or starts swirling around with little or no head movement.

Really bizarre, since everything was working fine just an hour ago.