CDR reports > call recordings download issue

I have 2 freepbx distro installations.
One has dynroute module installed, the other not.

I'm using the latest call recording and CDR reports modules.
Call recordings are activated on the both servers.
The first server has a custom location for call records (the folder has unsecured 0777 permissions :d)

When I go to the CDR Reports and I click on the download icon of a recording, I'm getting a blank page on the first server and a page that says dynroute module is unsigned on the other server. See screenshots for more details.

I can playback the recordings in the browser. The recording files exist on the file system on both servers.

{noformat}
[root@cc ~]# ls -l /var/spool/asterisk/monitor/2017/01/19
rw-rr- 1 asterisk asterisk 510764 Jan 19 17:39 out-0471473312-1090-20170119-173820-1484843900.71111.wav{noformat}

There is nothing in httpd error_log or freepbx_log.
httpd access_log:

{noformat}
84.*..* - - [20/Jan/2017:10:02:51 +0100] "GET /admin/config.php?display=cdr&action=download_audio&cdr_file=1484843900.71111 HTTP/1.1" 200 901 "http://******/admin/config.php?display=cdr" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36"{noformat}