Why do my walkup buttons have a red X through them?
This is because the batter (shown at the bottom of the lineup) doesn’t have a walkup song defined. Touch “Edit” to edit the lineup, touch the player to edit that player and click the “Walkup Song” menu item while editing the player.
Why do my player walkup and announce buttons sometime disappear?
The button visability is based on home/away and inning information. So if you are announce the home team, the buttons will only be visible if you are in the bottom of an inning. Change the inning information (just below the score) to see the walkup and announce buttons.