Originally Posted by jeremybirn
Also make sure you have enough trace depth! The number of refraction steps (in the shader, and in your render settings) needs to be at least 6 or 8 in a scene like this. It defaults to just 1 or 2 in most software, so fix it in the shader and render settings. For shadows, also check the number of steps or rays in the light, to make sure you can see the shadows through the refractive glass.
also, (in maya) I had to manually turn on "visible in refractions" and "visible in reflections" in the render stats tab of each bottle....so I'm not sure if that was just the way my settings default to for some odd reason or if this is is turned off in the downloaded scene.