Pie chart animation

I was trying to resurrect some old code from this old tutorial:

http://www.actionscript.org/resources/articles/168/3/Dynamic-masking-using-the-drawing-API/Page3.html

I’m not figuring out why the “maskee” isn’t being shown beneath the mask.

The tutorial talks about using a stroke and no fill for the circular shape, but I’m using a filled circle (and I don’t think that should make any difference).

Can anyone spot what the problem is?