LiveTV uses UP to go up the channel list, Guide uses DOWN.

[mythtv@…]

Horribly confusing for this newbie. The Guide order is upside-down compared to the LiveTV way of changing channels with the arrow buttons. I couldn't find a setting for this so I think it's a real bug. Reversing the guide order is going to confuse/annoy everyone that is already used to this so maybe a new config option is in order that gets set true on new installs but defaults to false on upgrades.