I've seen this happen with 32 bit bitmaps imported using photocaster.
If you set the ink to matte, you'll get unremovable white around the
edges.
If this is the cause take the pieces and edit them in Fireworks: set
Fireworks as your bitmap editor and open and resave each member as a
24 bit PNG. No more white goo.
If it's a different problem then I have no idea.
Rob
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