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In FSX, once I leave the default virtual cockpit view and go into another camera view, I can't use the default keystroke (F9) to return to the default VC view. If I hit F9 the light goes orange, and the view freezes. It will function again if I hit F9 a second time - it toggles between frozen/unfrozen - but it will never return to the default VC view.

This only happens when the TrackIR software is loaded.

Give this ago.
Click on 'Edit' for the profile that you want to use.
Then click on HotKeys at the top.
Click 'Change' and then click on a free key (hard I know in FS X) or a button on your stick that you want to use.
You can select any key/button that you want for any of the 3 controls in the HotKeys window.
Then put the VC back onto F9.