Well, the new debug version (3.3.7251 P) works just fine (with an MP3 at start up). I played through 2 DSD128 files, and MB had started playing a DSD64 file when I stopped playback.
Here is the error log:
11/8/2019 1:57:49 PM - init chans=2
11/8/2019 1:58:17 PM - init=-2147483646,source rate=5644800, remove silence=False,is tempo=False,decode=False
11/8/2019 1:58:17 PM - set attrib=BASS_ATTRIB_VOL=1
11/8/2019 1:58:17 PM - play=False,output=0,stream in mixer=False
11/8/2019 1:58:17 PM - play is paused=False
11/8/2019 1:58:17 PM - set bit streaming=BASS_SAMPLE_FLOAT, BASS_DSD_DOP, BASS_STREAM_DECODE, BASS_ASYNCFILE,current mode=PCM,new=DOP,chans=2,2,rate=352800,0
11/8/2019 1:58:17 PM - set raw streaming done
11/8/2019 1:58:17 PM - assign channel before=0,after=-2147483644,mode=DOP,started=False
11/8/2019 1:58:17 PM - assign channel undo pause
11/8/2019 1:58:17 PM - assign channel done
11/8/2019 1:58:17 PM - play started1=True
11/8/2019 2:01:18 PM - init=-2147483639,source rate=5644800, remove silence=False,is tempo=False,decode=False
11/8/2019 2:01:21 PM - remove eos 2=-2147483644
11/8/2019 2:01:21 PM - remove eos done
11/8/2019 2:01:21 PM - close stream=True
11/8/2019 2:01:21 PM - close stream remove end sync
11/8/2019 2:01:21 PM - remove eos done
11/8/2019 2:01:21 PM - close stream remove mixer
11/8/2019 2:01:21 PM - close stream handle=0
11/8/2019 2:01:21 PM - IsSamePlaybackSettings rate=352800,352800, flags=1024,1024
11/8/2019 2:01:21 PM - play=False,output=-2147483644,stream in mixer=False
11/8/2019 2:01:21 PM - play is paused=False
11/8/2019 2:01:21 PM - play add to existing=False
11/8/2019 2:01:21 PM - play started2=True
11/8/2019 2:01:21 PM - set attrib=BASS_ATTRIB_VOL=1
11/8/2019 2:04:22 PM - init=-2147483633,source rate=2822400, remove silence=False,is tempo=False,decode=False
11/8/2019 2:04:25 PM - remove eos 2=-2147483644
11/8/2019 2:04:25 PM - remove eos done
11/8/2019 2:04:25 PM - close stream=True
11/8/2019 2:04:25 PM - close stream remove end sync
11/8/2019 2:04:25 PM - remove eos done
11/8/2019 2:04:25 PM - close stream remove mixer
11/8/2019 2:04:25 PM - close stream handle=0
11/8/2019 2:04:25 PM - IsSamePlaybackSettings rate=176400,352800, flags=1024,1024
11/8/2019 2:04:25 PM - Reset5
11/8/2019 2:04:25 PM - reset -2147483644
11/8/2019 2:04:25 PM - assign channel before=-2147483644,after=0,mode=DOP,started=True
11/8/2019 2:04:25 PM - assign channel paused
11/8/2019 2:04:25 PM - reset done
11/8/2019 2:04:25 PM - set attrib=BASS_ATTRIB_VOL=1
11/8/2019 2:04:25 PM - play=False,output=0,stream in mixer=False
11/8/2019 2:04:25 PM - play is paused=True
11/8/2019 2:04:25 PM - set bit streaming=BASS_SAMPLE_FLOAT, BASS_DSD_DOP, BASS_STREAM_DECODE, BASS_ASYNCFILE,current mode=DOP,new=DOP,chans=2,2,rate=176400,352800
11/8/2019 2:04:25 PM - set raw streaming stop
11/8/2019 2:04:25 PM - set raw streaming done
11/8/2019 2:04:25 PM - assign channel before=0,after=-2147483631,mode=DOP,started=False
11/8/2019 2:04:25 PM - assign channel undo pause
11/8/2019 2:04:25 PM - assign channel done
11/8/2019 2:04:25 PM - play started1=True
11/8/2019 2:04:31 PM - close stream=True
11/8/2019 2:04:31 PM - close stream remove end sync
11/8/2019 2:04:31 PM - remove eos 2=-2147483631
11/8/2019 2:04:31 PM - remove eos done
11/8/2019 2:04:32 PM - close stream remove mixer
11/8/2019 2:04:32 PM - close stream handle=0
11/8/2019 2:04:32 PM - Stop1=True
11/8/2019 2:04:32 PM - stop -2147483631
11/8/2019 2:04:32 PM - assign channel before=-2147483631,after=0,mode=DOP,started=True
11/8/2019 2:04:32 PM - assign channel paused
11/8/2019 2:04:32 PM - stop: before=True
11/8/2019 2:04:32 PM - bass stop -2147483631
11/8/2019 2:04:32 PM - bass free -2147483631
11/8/2019 2:04:32 PM - bass free done
11/8/2019 2:04:32 PM - stop done