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The addons are almost too numerous to list - FS Navigator; Flight Environment; Ground Environment Pro; Ultimate Traffic; Active Sky; FSHotSFX ... as well of course as a large number of a/c and scenery add-ons.

There's normally no Firewall or Anti-virus running when I am flying FS9 (the PC doesn't connect to the internet).

M

Do you have any installed?

There are anti-virus and firewalls programmes on the machine, but they do not load at start-up. I only load them on the rare occasion I connect the machine to the internet.

And what applications are they? (AVG, Norton, etc.)

AVG Free & Zone Alarm Free ..

In the following folder location, C:\Program Files\NaturalPoint\TrackIR4\Profiles, what is the file size for each profile?

All marked as '4KB' (between 3.7 & 3.9, in fact), apart from Combat_Flight, which is 2KB.

I wonder if any of the other add-ons have a head latency, view changing option.....

Not sure what you mean by that, to be honest. I wouldn't be all that surprised if there is something in my setup (it's so complex after all this time!) that is causing TrackIR to tremble or go slightly 'crazy' occasionally. (Could this happen when frame rates are low, for example?).

It would be good to track down the causes of this, but at the same time it's not frequent enough to be a big problem. Just flew a helicopter from Marseille to Nice (about an hour - great scenery!) and had no problems at all; TrackIR very impressive the whole way.

If you have any ideas I can try, great, and I'll let you know if the problem gets any worse. Meanwhile, it's not, as I say, stopping me from enjoying TrackIR most of the time,

Martin

Sometimes I let my thoughts end up on the posts, just starting run out of possible ideas........