Hi to all
I get today an error with RCONFFAIL after running the latest upgrade script 5.211.65-16:
Critical Error retrieve_conf failed, config not applied
Reload failed because retrieve_conf encountered an error: 255
Added 10 seconds ago
(freepbx.RCONFFAIL)
At command line it reports the following message:
PHP Fatal error: Call to undefined function broadcast_backgrounddetect() in /var/www/html/admin/modules/broadcast/enc/functions.inc.php on line 73
My workaround was to disable the FreePBX broadcast module, - now the error message is gone. When enabling or reinstalling the broadcast module the error message appears again. So, this error is still present. 
Information, - I have followed all the necessary upgrade steps. It was executed from FreePBX version 5.211.65-15. All previous upgrade scripts have worked perfectly.