Lost Headphone Sound on K v17.0 when I updated to NOUGAT

The title says the short of it; I updated my Xperia Z4 from 6.0.1 to 7.0 last night.
When I loaded K v17.0 (GIT20170205-0cbe762) and now every time I do, there’s no sound whenever I’m using headphones.
Just to clarify, sound with headphones sounds perfectly in all other apps (YouTube, IMDB, Music, etc).

Sound works correctly (but a little lower than when on 6.0.1) when I’m not wearing headphones.
There’s 0 sound when I plug them in, no system sounds (clicky sound whenever I scroll through options) or audio from Movies, TV Shows, sounds, streams from Addons, nothing.

I’ve looked through the entire apps and I can’t find anything.
Under Settings > System Settings > Audio
under Audio Decoder, the first option, named “Audio Output Device” is shaded, I cannot edit it in any way.
it only shows “android, audiotrack”.

I’m thinking about uninstalling the app and re-installing it.
I was hoping someone could suggest something before I went down that path.

Sent from my SGP771 (typie typie)