I am running 18.2 on an RPI3. I do not have any illicit addons or repositories. While I was watching a show on the Netflix unofficial app I went to scroll forward and for whatever reason it rewound to the beginning. When I hit play I had no sound. I restarted my box a couple times and it didn't help. I jumped on youtube and discovered I had the same problem. I havent touched any settings. My regular videos and audio files work. Even stranger, all the system sounds work while in the addons section. Back, scroll etc.
Also, under audio settings during playback audio stream is greyed out.
Would really like to fix this as I just got the Netflix app to work so I can watch The Order on my 50 inch tv instead of my phone.