Ah ha ... here's the problem Bruno021.

Loading one image, Vue loads the alpha.  But if you load a sequence of images, it DOES NOT.

So Polax, you've got the answer, but I couldn't quite follow your guide.  I added the filter to the alpha side, but all I got was a semi-transparent image.  It didn't seem to key out the white.

Is there a tutorial on this?  And thanks.