Yes the setting changes. In the past, if you enable "Sync playback to display" you have had some options...."Drop/dupe audio" and/or "Drop video". Those options doesn't exist anymore. Don't ask us why. Team Kodi removed them and we only use what we get.
So comparing with an older Kodi version (which OE ships) doesn't make sense. Probably even OE 6.95.3 might be older than our 7.0.2.
Getting no sound by disabling that feature is nearly impossible, because by disabling this feature you will have passthrough which you didn't have before. So...as I have intel hardware myself...the settings you should set are:
- disable "Sync playback to display"
- enable passthrough and select the formats your AVR is capable of
- be sure any setting is correct AVR wise
- enable VAAPI and disable VDPAU (<- this wouldn't affect the sound, that's only for video, but do it anyways because by disabling both you don't have hardware acceleration at all).
If you still have sound issues, then came up with a new log...
- enable debug logging
- reboot the machine
- play a DTS movie/file directly after boot (don't do anything else, no library scans, no addon launching...nothing...only the movie. If necessary disable "Update library on start" if you have it enabled and if, disalbe all PVR services you might have running)
- grab a log