It's not a TrackIR problem it's an Aces High problem. If you're looking behind you and your head is "against the seat" then you can't shift your view to the left or to the right to look around the seat. If you move your head away from the seat even a little bit then it works fine. This didn't start to happen until Patch 4.
It's not a huge deal but it does become a bit of a pain when you need to whip your view around real quick and don't have time to think about a workaround solution.
It's not something I've noticed, but I haven't flown bubble canopy birds much lately. Just wondering, can you turn off trackIR with f9, hit a view button and release it to center it, then move your head forward a tap or two with the up arrow, hit f10 to save the position, and then reenable trackIR and have the views work again the way you want? If it works, you'd just need to do that for the all the planes giving you trouble.
I'm just trying to think of a workaround based on what you guys are describing until they fix it.
Wiley.