If I'm not mistaken, the ecam system pages should basically switch on their own to the most important page.. example, when you begin engine start, it shows the engine page. move control surfaces the controls page shows. once airborne, it goes to the cruise page, on landing it shows wheel, starting apu, it shows the apu page. etc. etc.
well my aircraft stopped doing it. it will stay on doors page, i wont get the takeoff checklist on the ecam either. once airborne, it does switch to cruise page.. and i think its fine until shutdown.