[pkscout]

After some investigation, I found that the DTSHD codec on this box is actually named 'dtshd_ma', not 'dtshd'. So as an experiment, I changed the string 'dtshd' to 'dtshd_ma' in apsettings.py line 50, in audioprofiles.py line 150 and in settings.xml line 655 (the only instances of the string I could find).

I don't know whether I needed to change the string in all three of these places, but this has fixed the problem and it now detects and switched for both HD audio formats.

I was wondering whether there was any way you could make this workaround more permanent, or will I need to reapply it on each new version of the add-on?

Let me look.  I can either add dtshd_ma as a valid DTSHD match or do some fuzzy logic to match anything that starts with dtshd.