Only mono stream with Propfrexx

[StationX]

Maybe someone can help me, my output from Proppfrexx goes mono into the stream, the players do play stereo in the mixer but when I listen to the stream it is mono, everything already tried, clean Windows, clean Proppfrexx but no result

[radio42]

Check your encoder profile settings.
The ProppFrexx output is by default always stereo.
So the only option, where it can be mono is either your sound device driver directly (which might be unlikely) and the stream encoding format.