Sorry for reviving a thread that's been dead for almost a year now,
But I'm having the exact same issue. I also turned off exclusive mode too so it isn't that.
Everything is checked, all audio sources for media is turned on and maxed, I even manually added slplugin & Dullahan through my firewall.
It's odd because it was working fine about 3 or so months ago and now no matter what I do I can't hear media audio.
Does anyone know any other possible solutions?