So, I recently updated and got back to using this program after a while. Twice in the same day, the program closed suddenly with seemingly no explanation. I found out it had to do with playback device switching. Oddly enough, it won't close suddenly if you start with a monitor-integrated fallback and plug something in, as it'll keep using the monitor speakers, but if you start out with headphones and they become disconnected, it won't go to the fallback instead just close.
In trying to replicate it, sometimes I get lucky and playback merely stops, giving an error that says "Unable to open sound device 'WASAPI' - Default Device (PortAudio)" when play is pressed.
I feel like the more I try to test it, the less reliably I'm able to replicate it.