I am having a problem with **refraction** in Carrara so I was wondering if anyone has any suggestions. 

I am trying to render a glass sphere, with a small thickness added, that has a plane with an 
image on it, placed inside the sphere. I've tried several different file formats to map the image
on the plane, but the alpha is refracting, causing it to be visible. (see image)

I also made sure reflections and highlights are turned off in the shader, and it still isn't working.

Any help would be greatly appreciated!