Denon HDMI – Nothing Will Play

Hopefully this hasn’t been answered too many times before but googling has not helped me much so far.

I have a Denon AVP-A1 and this previously worked fine with Kodibuntu with Kodi 16. I have since tried both Ubunutu 14.10 with Kodi 17.1 (Nvidia Prop driver installed and switched to ALSA) and LibreElec compiled from master. Exactly the same issue seems to occur with both. If the audio is set to non hdmi (Eg. Pulse Audio Bluetooth) then the video plays fine. If the Denon is selected as the output for sound (With or without bitstream) then the video and audio fail to play.

Here is my log:
https://pastebin.com/ihWJgSRp

Can anyone give any ideas on how to fix this?