EDIT: It works now. There seem to be issues with the new web player.
I tried to play some music in the web player, wich worked perfectly a few days ago. Now, with the new design, I get an error message that something went wrong with my playlist and there's a reload suggested. But this changes nothing. There is no sound if I try to play music and if I reload the error message reoccurs.
Things I tried:
granting exception in Chrome for the new URL (open.sportify.com)