LOL, I wasn't ticking you off mate, it's just advice/info for you to use as you so choose
.
Otherwise...
1. You don't need to install another add-on for watched status, Kodi already has that feature natively.
2. Subscene worked well for me with Kodi 18 subs but admittedly I haven't tried it with Kodi 19.
3. Double check the actual device audio settings & all of Kodi's audio settings again as you may have missed a step. Also, ensure the "
sync playback to display" option is
disabled or passthrough won't work. (I also use an AVR. Kodi 18 functioned very well with audio passthrough & so far I haven't experienced any issues at all testing Kodi 19 too.)
It's still relatively early days with Kodi 19 & it doesn't yet have as many add-ons available as Kodi 18 previously had, have you tried Kodi 18 instead?
Additionally, you previously mentioned that your original XBMC stopped updating watched status', it also hasn't been working with Kodi 19, & you reverted back to a fresh XBMC where the watched status failed again which would indicate you have a global issue rather than one version being affected. (Obviously the audio passthrough option could be specific to your hardware & Kodi 19.)
Have you been installing this extra watchlist add-on every time? (That could be the actual cause in that it's cancelling out Kodi's native feature.). Or, am wondering if there's an issue with your source as to why your watched status are not correctly updating? (Perhaps
@pusb87 could help you troubleshoot that aspect as he also uses a MyCloud & from previous discussions his watched status have always seemed to work well with Kodi 17, 18 & 19!!??)
If you're still not getting anywhere after all of this I'd suggest installing the log viewer add-on as well & enable component specific logging in Kodi. From the log files you may immediately see the errors yourself to be able to quickly correct the problem. Otherwise, you'll probably have to upload a copy of your log file for the Kodi devs to debug a cause.