2.1.0 showing ON AIR and stream connected when there is no stream connected..

I just did a clean install of airtime 2.1.0 on a Ubuntu 12.04 desktop VM and then configured the Master Stream. If I try and turn the stream on without connecting a source first, there's an error saying there is no stream connected. I then connect a stream and connect it in airtime and the ON AIR light comes on. If I then close my streaming client, it disconnects the stream and ON AIR goes off, however the stream is still 'available' to reconnect. I can reconnect the stream even though nothing is there!

This happens with Nicecast, BUTT and darkice. In the attached screenshot I have just reconnected a non-existent stream...

James