I have just updated both computer and ACAD to 2013 version. My previous visualisation shows up black rather than showing colors, and when I render the image it shows nothing. I have checked all the parts and the materials are listed under the properties palette. I am not sure how to remedy this as I am just starting out to do this type of 3D work. Most of my work is done in normal hidden for dormer and roof framings for site built/modular companies, but now I am asked to do some photo realistic versions for marketing and customers alike.