Hey Steve, thanks for the reply. Indeed, it sounds like that could have been the issue, but I didn't kick the auto DJ at any point. I eventually deleted that station and recreated it, only to find that it exhibited the same behaviour. I eventually deleted it and renamed it at which point it worked ok.
I should mention I have other stations running which are all ok, on the same server with the same set up etc (Shoutcast/sctrans) so don't think it's something to do with my set up.
More strange still, and I think related, is this, which has only just occurred. I create a new station, upload media through the upload media window (a couple of tracks), hit start auto DJ, which returns a successful activation message, and then the auto DJ still show itself as off.
Additionally, when seen from an admin log in, it reports everything as on via the images, but that the station is offline, as per this screen shot.
I will keep working through and report any finding I have on this. Maybe it's something I'm doing wrong, but can't imagine what. But yeah, I'll report back if I find a way to resolve this.
I'm running Centova Cast on Cent OS 6 if that is of any interest.
(PS, with this latest station I've not even set up a DJ to connect. This error happens before I even got any music playing through this station at all).