Windows 10 app NOT PLAYING ANYTHING. Just loads...

windows-store-app

#1

I can select a user. I can refresh and browse the contents of my server... But if I play anything, it will start loading it (spinning dots animation), the screen goes black (dots still spinning) and that's it. Nothing plays.

I have rebooted, restarted the server (which works fine through WEB version and ROKU) and I've reset the Windows PLEX app.

HELP?