Quick question, when you add an eventListener to the stage (in this case a keyPress), is there an inherited 'on enter frame' running?
Reason I ask is that when I add event listener to 'this' (this.addEventListener...) in my player class it wont move, but when I add to stage (stage.addEventListener), I can move it. Just wondering if that's the discrepancy?
I don't think so because in your case it is all about focus. (correct me if i'm wrong)
When you have written this.addEvent... have you tried to click on the player?
When you are using this you are focusing to the Player object on stage and when you are using stage you are focusing on the whole stage.