The reason I started to think this is the case is that I get sound out the digital connection but not via USB.

In neither case do I get the blue light.

So I think LMS 7.8 cannot send/stream a MQA file and then there is a bug affecting the USB out.

Main: Marantz Cinema 50, Meridian 271, DSP7200.2, DSP5200HC, DSP5000 rears, Meridian 210.
PC/Headphones: Mytek Liberty II, Sansui CA-F1, Sansui B-2301, Sennheiser HD800, Kef R3