Stream without sound

I have a seasonal web stream ( "Q Music Christmas", NL ) I listen to every year in december.
Last year it worked, this year it doesn't.

The strange thing:
- stream starts
- progress is shown ("time")
- track information are shown correctly (and change with every new track)
... but NO sound can be heard.

If I start the stream using my web browser or VLC it runs finde.

Any idea what I get wrong?
btw, URL is
https://icecast-qmusicnl-cdp.triple-...lassics_96.mp3

Thanks!