I have just loaded a DSD file (in DoP format) onto Sooloos (the current version) and it loaded fine - it has never done this before.

I then played the file into an independent DAC via ID41 on an 818v2 with MHR turned off. The sound through the speakers was a faint hiss but the track was audible underneath the hiss. I am guessing the hiss may be something to do with MHR so it may be worth trying through DSPs with MHR enabled.

The DAC was showing the DSD track at "24/88". For a DSD track it normally shows "DSD".

Streaming: Roon, NUC, QNAP869 NAS
2ch system: dCS Vivaldi, Audionet Stern, Audionet Heisenberg, Magico Q1
Retro system: 101/104/105, Red Rose Spirit