What does the red X over the icon mean.
It cant display an icon/preview for the material. Nothing to worry about it will still work. What version of maya are you on? I think either 8.5 or 2008 displays mental ray materials in the preview.
Thanks. I'm on 8.5 at the moment but have purchased, and waiting for, 2008. It's on back order from my supplier. Thanks for your reply.