The latest experimental version of the player containing the Shimmier features a minor annoyance which doesn't seem to have anything to do with the introduction of the new skill at all:
The "Let's go!" sound at the beginning of a level is only presented on the left ear exclusively, no matter how far to the right the hatch is placed. Since the location of the sound usually tries to emulate the position of the hatch relative to the camera, meaning the sound will wander from left to right if you move the camera around before releasing the pause button, I guess there's something off with that location-determining routine? Because the sound file itself did not change, so there's nothing wrong with the inherent panorama information of the WAV file.
It's especially striking because the hatch opening sound which comes immediately afterwards is presented on both ears again, dead centre
.