The event "Fly, White Bird, Fly!' from Isabel's route seems to be bugged. Whenever I load a save after I have completed that event and enter my room in the time from Morning to Afternoon the event repeats. When I play the event and don't load a save at some point I can enter my room without triggering it. I don't know anything about programming, but it looks to me like loading a save resets the trigger for the quest or something like that.