Hi,
I know its not nice to scan but a reinstall of mumble did not help and wondered if its a server problem.
Since the default mumble port isn`t open I assume that the process is stopped. Of course it could have also other reasons 
2015-05-09 15:55 CET
Nmap scan report for mumble.adiclan.com (198.154.109.162)
Host is up (0.18s latency).
rDNS record for 198.154.109.162: cust-198-154-109-162.corexchange.com
Not shown: 998 filtered ports
PORT STATE SERVICE
22/tcp open ssh
80/tcp open http
Maybe someone have time to restart mumble on the server. (But since the website has a different IP, I think it`s a shared mumble server?)