I just tried playing the original 24-bit FLAC files (without launching the iPhone app). The first track I attempt to play begins playing, but the Mac Audirvana UI is unresponsive for 45 seconds or so. Activity Monitor shows “not responding”. But eventually the Mac UI comes back alive and I’m able to skip around the different tracks without any problem.
Again, this was after restarting Audirvana and not launching the iPhone app.