I've searched through every site I can find so far and nothing works. File associations, changing default player, disabling Cortana/re-enable wipe-type, and a few other things that have been suggested, including yours have all failed. I'm not sure exactly what day it stopped working because I wasn't using it too often. However, in November, I'd found more fun in having my headset on and randomly starting a song to scare the hell out of my roommate.

Now that I'm actually just trying to listen to music in between people coming in and out of mumble, it stops functioning. Instead of "pause", Cortana "stops", therefore I can't order her to "play". If you find some solution though, please share, it's highly irritating to have such a nice function just stop working.