FreePBX 13 - WAV files won't play

The problem is right there ^ Asterisk is not running. It might be running as root but that is just as bad.

[root@freepbxdev1 ~]# ls -l /var/run/asterisk
total 8
srwxr-xr-x 1 asterisk asterisk    0 Sep 22 13:44 asterisk.ctl
-rw-r--r-- 1 asterisk asterisk    6 Sep 22 13:44 asterisk.pid

Yours is probably "root root" or the folder itself is owned by root.