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No latency but on a guess I deleted Active Camera... the twitching is completely gone. I only checked for about 5 minutes of flight time but so far so good. If it remains gone I'll let you know. Others may try the same fix.

<t>I tried it with FSInn turned off and the twitching is still present. It is much more pronounced when the mouse is active on the screen and nearly disappears when the mouse is on the start bar at the bottom or on a separate monitor. As I fly longer the twitching is constant regardless of where the...

<t>Do you have any add-ons installed for FS9? Yes<br/> - Multiple aircraft<br/> - ASv6.5<br/> - Ultimate Terrain<br/> - FSinn<br/> <br/> What OS are you running? WinWP Pro SP2<br/> <br/> What version of the TrackIR software are you running? TrackIR v5 but twitching ocurred under v4 (3.1.036 and 4.1....

I was able to eliminte the twitching by changeing roll to "dead zone" from "smooth"... but that only worked for one flight. The twitching is back and changing TrackIR doesn't appear to have any effect.

<t>I am also seeing twitching. The view screen looks normal, all lights visible, nothing blocked, green lights. But the screen twitches almost constantly. The twitching looks like it moves up and down about 1/4 inch. Just enough to keep you from clicking anything and making flight nearly impossible....