Hi v-jbinney.
What you are seeing is a bug with the way cal3d handles specular highlights. You can fix this problem by changing the specular color to black (it's white by default), as in the attachment, or by increasing the number next to specular level.
Basically, if you want something to look shiny, leave the color as white, and crank up the number next to the specular level, and if you want something be matte, leave the number at zero and set the specular color to black.
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