I've been working through the Captain Blender tutorial in the "Introducing Character Animation with Blender Book" and have hit a road block at the eyelashes.  The picture below shows the problem.  Top picture is the render of just the eye lashes.  At this point they render as they should, with the transparency working perfectly.  When the eye lashes are in position with the mesh of the head I get this strange block of solid colour where the eye lash mesh and head mesh touch.  If I move the eye lashes a short distance away from the head mesh they render properly again.  Can anyone tell me why this might be occuring?

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