An extra choice in the menu for audio should be : unaltered passthru.
That way everything comes through SPDIF to your receiver and your receiver will be the decoding device. It's for sure that now there is some changing in the files before they are passed through, because it won't play DTS WAV. It sees wav, it sees 44.1 Khz and gives you white noise.
Unaltered it would give you 6 channels of DTS surround in 44.1 Khz.
(I assume they alter it before passing it through into 48 Khz, because movies with DTS don't give problems.)
And....this has nothing to do with the licence from DTS ! DVD players with decoders also work without a licence from DTS.
This is BTW the same problem as a lot of Soundblaster cards on the PC. Signal put into the Soundblaster was always changed to 48 Khz before sending it through SPDIF and thus made DTS encoded CD's worthless to play on a PC.
I'm not technical, but it seems a minor modification.........