The Wackiest thing, Numbers match, but it's half the size

Question

Ok,
This is the code (document class).
public function LoadingDoors()
               //Check for a Reference to the stage.
               if (stage){
                    //already have stage access
                    onAddedToStage();
               } else {
                    //need to obtain stage access
                    addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
          private function onAddedToStage(event:Event=null):void
               //remove the listener as it is no longer needed
               removeEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
                        //Align the content to the top left of the stage.
               stage.align = StageAlign.TOP_LEFT;
               trace("stage width from Doors " + stage.stageWidth);
               trace("stage Height From Doors " + stage.stageHeight);
               this.width = stage.stageWidth;
               this.height = Math.round(stage.stageHeight);
               trace("Doors Width after assignment " + this.width);
               trace("Doors height after assignment " + this.height);     
The following traces out.
stage width from Doors 1264
stage Height From Doors 685
Doors Width after assignment 1264
Doors height after assignment 685.05
First odd thing is the 685.05 value, when there is a math.round(), does not seem to be rounding it.
Second and more important is when I look at my Flash player, it is at the dimensions shown, 1264x685, however the swf, shows the same dimensions 1264x685.05 but yet only takes up half the swf player screen in the Y axis. The x axis of the swf stretches to fit. 
example image:
Anyone have any Ideas why this might be happening?

Answer 1

Sounds like you turned on Digital Cinema Desktop Preview. Under the View menu in the Finder bar, select External Video and make sure it's turned to Off.
I've seen weirder.