can you post a screen shot of your material room settings?

Have you tried simply using another material just to see, e.g., select all nodes and delete the present material from the skin, it will then just be white preview. now create a new diffuse_color node like a 2D texture map and just select any jpg you have handy. make sure transparency is 0.0 with no other settings except diffuse_color set to white. that should help pin down the problem.

HTH,

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