Re: Directional audio
From Blueberry's reply here.
"Microsoft has received reports that audio in certain games is quieter or different than expected after installing this update. At the request of some of our audio partners, we implemented a compatibility change that enabled certain games to query support and render multi-channel audio. Due to customer feedback, we are reverting this change as some games and some devices are not rendering multi-channel audio as expected. This may result in games sounding different than customers are used to and may have missing channels."
Sounds like you got ripped off by whoever sold you those "studio monitor" headphones.
I'm a sound engineer by profession, and any headphones that don't offer multi-channel compatibility are de-facto not professional headphones. If you actually paid $400 to $500 for those, you got scammed.