As has been reported over the past few years, for some reason there was an incompatibility with the Bryston BDP-3 (and the upgraded BDP-2s) and the PS Audio DirectStream DAC with 192kHz 24-bit files using AES/EBU (and SP/DIF?).
Thanks to the efforts of Ted Smith, the designer of the DirectStream software, I believe the problem has been solved! Ted sent me a beta version of the next firmware release for the DS DAC and I used it with new BDP-3 that arrived today. I used a High Fidelity Cables "Pro" AES/EBU cable, and have had zero problems so far playing 192 kHz 24-bit files from both Qobuz and an attached USB drive. Well done, Ted!
Last I checked with PS Audio, the latest firmware should be released soon, hopefully keeping this fix in.