Dynamic tuning issue
I just noticed that when you are recording three shows on the mother unit, you CANNOT get live TV on the Mini if on the mother unit the active tuner is not on one of the three programs recording. If you change the tuner on the mother unit onto one of the channels that is recording, then live TV is available on the Mini.
This isn't a good thing and I'm not sure why it is this way. Perhaps it is this way so two viewers, one on the mother unit, one on the Mini, don't interfere with each other, e.g., pausing, etc?