It was an older MC19 client connected to the latest MC20 Server where I kicked off a watching a Live TV channel (believe it or not on my treadmill). I then (thought) I stopped it on the client but found today it was still buffering the stream on the server. It was about 12GB of JTV time shifting files but was only from the last XX hours (not from the time I would have started watching it). I could not delete it or stop it from the MC Server instance but had to stop MC and MC Server, then restart MC at which point I could delete it.