I know this is not a current thread, but I came across it in my search to address the borders added at the top and bottom of the projector after the showmenu=false command executes.
This seems to only be a problem when authoring in Flash MX. The same code authored in Flash 5 has no adverse effects.
(It doesn't matter whether the code is written as
I found no answers in this or the Flashkit forum for this problem specifically, but did find a solution here:
It's an admitted hack, but it works, and I was so relieved to find it I thought I ought to post back here for anyone in the same boat.