🚀 go-pugleaf

I've got two rasterized images (one overlapping the other, 1 Reflex blue, 1 warm gray) 

Rasterized in Illustrator 10.02, (Color model bitmap, Background transparent) 

However the "transparent" parts of the top image is knocking out the lower bitmap. 

It works fine if I rasterize the two files in photosohop and place the files into Illustrator.  It works fine if I rasterize and print them in Illustrator 9.02. 

It works fine if one of the colors is Black and the "overprint Black" is checked in the separation dialog box. 

However if I do the rasterization in Illustrator 10.02 (Color model bitmap, Background transparent), the top one knocks out the bottom one.   i.e. the background isn�t transparent if Black isn�t involved. 

The fact that this works in illustrator 9, or with placed rasterized files from Photoshop, seems to imply to me that there is a problem with rasterization files within Illustrator. 

Unless I've missed something...? 

If someone is really enthusiastic, I am more then willing to e-mail him or her the file...