Couple things I noticed, lets see if anything of them are the culprit...
First in your first style (menuStyle):
There is no 'status' attribute for styles, those must be defined in the menuItem individually..so take this out. There is also no topbarimage property of a style. Now this style is only used by the top menu which is always visible, so your over and out filters are a problem since there is no transitions. So make outfilter = "" and take the Fade filter out of your overfilter. Its ok to leave the alpha and shadow (I think) because they will stay with the menu at all times.
Secondly in your first main menu (Menu):
you specify a top and left pixel position AND screenposition. These contradict each other. I tried it on my machine and the top/left seem to override the screen position, but I think it would be a good idea to remove this just in case.
Thats about what I can see at the moment. Your shadow filter seems fine at a strength of 3. I actually have my own set to 4, so I see nothing there. Try changing these things and hopefully it will work.