[iamgoat]

I've since downgraded, but for the day where I was using the new version I had to switch to something more clunky:

  SetTitleMatchMode 2
  IfWinExist,Spotify Premium
  {
    WinActivate
    sleep, 100
    send, {space}
  }
  SetTitleMatchMode 1

And alt-tab may also help, but it sometimes brings up the wrong window.