Test Movie preview problem, pls help!

Hello there,

I found this problem when I was trying to make an animation in CS3; When I press alt+enter for Test Movie, the preview .swf is shorter in high than my original concept, which is very annoying…When I manually open generated .swf from windows explorer, player shows it correct. Any idea where can be problem?
Everything is shown in the picture, the first is swf manually started from explorer, the second my original concept of banner and the third that annoying wrong preview in cs3. I tried to change the version of player in publish settings also.