For the benefit of the general record and anyone else who might not want to inadvertently upgrade...
"This is probably because you ran the update utility script (/usr/local/centovacast/sbin/update) at some point in the past. The script usually downloads the latest version of Shoutcast DNAS and other third-party software, however the change in Shoutcast version wouldn't have been reflected until you restarted the station."
You can downgrade by overwriting 'sc-serv' with the older executable although it will require all streams to be stopped at the time of course.