Open php.ini file and find always_populate_raw_post_data -1 make sure it’s not commented out (no ; before that line)
Save changes and restart your web server.
Restart your player and try again.
If that’s not it, please show us a screenshot of status window on your player.
At the CMS server … the PHP53_error.log shows multiple entries … slightly different names:
[27-Sep-2016 11:06:21 America/New_York] PHP Fatal error: SOAP-ERROR: Encoding: string ‘O\x89…’ is not a valid utf-8 string in F:\Inetpub\wwwroot\xibo\services.php on line 131