I've got a strange situation that doesn't make sense to me, and I don't remember ever seeing it before. It doesn't seem to be a problem with Firefox.
I have a few links to audio files, and was switching between them, but after listening to one, switching to another then back, SM seems to load for infinity (player never loads and file never plays).
It goes something like this:
browse to https://myserver.com/sound1.mp3 - the native player loads and the file plays
browse to https://myserver.com/sound2.mp3 - the native player loads and the file plays
'back' to https://myserver.com/sound1.mp3 - the page is stuck in loading state
close the browser tab, open a new tab
browse to https://myserver.com/sound1.mp3 - still the page is stuck
I have to close SM and start it again before the file will play.
I'd expect closing the tab to be sufficient if 'back' in the same tab fails (but shouldn't!).
These are live streams and not static files, if that matters.