Hi, i downloaded a free 3d model from the internet.
it looks fine in the viewport, but when i render it, the texture disappeared and turned into a gray-transparent texture. Here's the link to the pic: http://i50.tinypic.com/352hz0m.jpg
I can't see what you're talking about - I get an error when trying to view the picture, but here's one thing to try. Switch your renderer from the scanline to Mental Ray, or vice-versa, depending on your setup.