Unfortunately, that doesn't seem to solve the problem. The DAC hasn't experienced this kind of problem before with DoP (it's designed to play DoP), I've got no idea why it's started up now. I didn't see the issue with MC 19, but now I'm experiencing it in both MC 20 and MC 21. I had someone a little more tech-saavy than me look at it, and he said the sync words were changed. I can get more information about that, if it'd help.
Oh, wait, now it's refusing to even play the file. I haven't changed anything, I just let it run longer (while not functioning), and the file stopped, and now I get an error message: "Playback could not be started on the output 'WASAPI' using the format 'DoP 2.8 MHz 2ch'. This ouput format may not be supported by your hardware." I get the same error message if I try to switch to ASIO (which has been behaving the same in other playback as well). Any ideas why I would newly get that error message instead of it just not outputting audio as before?