I looked through the old posts and didn't see this covered... although I did see Simon Key asking questions which made me realize he's mortal, phew!
If a face-up Continuous Spell/Trap Card, say Stumbling is already face-up and resolved on my opponent's side of the field, and my first action of my MP1 I activate Cold Wave... After that, my next action is to Normal Summon a monster... does Stumbling activate and turn the monster to face-up defense position?
Same scenario, but the opponent has an optional trigger, say Ordeal of a Traveler, face-up and resolved already, and I declare an attack that same turn. Can Ordeal be activated?
If a face-up Continuous Spell/Trap Card, say Stumbling is already face-up and resolved on my opponent's side of the field, and my first action of my MP1 I activate Cold Wave... After that, my next action is to Normal Summon a monster... does Stumbling activate and turn the monster to face-up defense position?
Same scenario, but the opponent has an optional trigger, say Ordeal of a Traveler, face-up and resolved already, and I declare an attack that same turn. Can Ordeal be activated?