Trouble with HelloWorld air app...

[Assertnfailure]

Hey guys, it's been a while....
Just today I picked up my copy of Flex builder 3 and am trying to build an AIR app, by following this tutorial: http://livedocs.adobe.com/flex/3/htm...lloWord_1.html

Only thing though...not only does the debug version not display the transparency (at least on a mac), but I also seem to only be able to generate unsigned AIRI files, which I can't execute....

Why isn't the transparency working, and what are you guys doing about the signature requirement?

EDIT: well, I figured most of it out....also it seems I've only been able to apply transparencies (or partial transparency) to secondary windows, and not the root WindowedApplication. I'm sure it's something dumb like the way Application has two layers of background color.