Hello Lazer.
Running SimplePlayer with -B
Ah, okay, you tried SimplePlayer, it'll be easier to find the culprit.
First of all, did you use the latest UOS source code:
https://github.com/fredvs/uos/archive/refs/heads/main.zip ?
Then, open /uos-main/examples/simpleplayer.lpi, compile, and run it.
When the first window appears, delete the library paths and keep only the first two (PortAudio and libsndfile): (see image1).
Then click "Load these libraries."
If that fails, close the application and restart it, deleting the libsndfile path, then click "Load these libraries."
If it loads, we know the problem is with libsndfile.
Do the same for libportaudio.
Once you've found the problematic library (sndfile or portaudio, or both), try replacing the library path with "system" (see image2).