Strange couplings in 4.0.021

[steku]

I just tested 4.0.021 with my profile made in 4.0.020. I discovered that when I look down (pitch movement) my in-game head at the same time is moving in Y and Z axes, so rotational movement is no longer independent of Y and Z movements. I tried to move my head carefully (only rotation without any horizontal movements). I'm using Track Hat with original reflector covered.

I returned to 4.0.020 (by uninstalling 4.0.021 and installing 4.0.020 from scratch. Those couplings are not present in 4.0.020. For me tracking is more natural in 4.0.020.

[steku]

Am I the only guy with this problem? I really don't know if I should use 4.0.021...