It's far more likely that the Advanced guide informaton is either missing from the 119 sat or corrupted. One would think that, when you power down the Zenith, it wouldn't send the tone to the multiswitch any more and would end up with the 101 sat by default. However, we all know the receiver is active all the time. (Which is why they call it "standby" and not "off" in the manual) So, perhaps it stays wherever you last had it.
Surprised you don't have either a second dish or the oval dish. HDNet is free with any subscription. And, if you have HBO, HBO-HD is included. You can do the extra gear on the cheap. I use two round dishes and a 22-khz switch (not a multiswitch).
Walking the fine line between jaw-dropping and a plain ol' yawn.