Since today's (2019-02-09) firmware update (to PKG6.5830.0205EUA), I have been unable to get any audio from my TV. I have an audio system connected via optical digital cable, which used to work fine, but now cannot detect an input. I tried all combinations of PCM / auto 1 / auto 2 outputs, DD / DD+, cache clearing.

I switched the audio output to TV speakers, but still cannot hear anything. Oddly, the TV app (aerial) does give audio through the TV speakers, but is set at a constant volume and doesn't respond to mute and volume commands. No other app e.g. Netflix, Google Play, Kodi, VLC, results in any sound. I have tried a full factory reset, but still have the problem.