Hello I’m Mike from Holland. On my PMS on my shield (500GB) I have the same problem. Plex does not play any themesong. I even add a themesong myself with a guide from Plex but even that song is not being played… Still no word from Plex HQ? I really hope they are going to fix it with a update. Even on my phone and my pc I have no sound effect with my series 
