Just to say I've used FLVPlayback on jobs many times, and sure it's buggy, but I've never seen this problem. You can definitely fix it. How are you going fullscreen? I've recently being doing something like this...
import flash.display.*;
import flash.events.*;
import fl.video.*;
import flash.geom.Rectangle;
.
.
.
myFLVPlayback.fullScreenTakeOver = false;
mc.stage.fullScreenSourceRect = new Rectangle(0,0,480,360);
myFullScreenButton.addEventListener(MouseEvent.CLICK, onFullScreenButtonClicked);
private function onFullScreenButtonClicked(e:MouseEvent):void {
mc.stage.displayState = StageDisplayState.FULLSCREEN;
}
(though i appreciate you might be using the fullscreen button in an FLVPlayback skin, so this might not be perfect)
NOTE: I just hammered that code in so it might not be perfect/complete. Hopefully you'll find it useful.
++ i'd make sure you set the size and scale of your flvplayback too, e.g. myflvplayback.setSize(w,h)
++ how about myflvplayback.scaleMode = VideoScaleMode.NO_SCALE;