In all likely hood you created those materials in the Light Works Render. In 2015 if you want to use those materials, you will need to purchase and install the LightWorks plug-in.
To set the rendering engine to RedSDK or LightWorks, you will need to access Camera properties for the different render settings, wireframe, hidden line, draft, quality and advanced.
To get there, right click anywhere on the drawing space then right click any one of the Teacups to open camera properties. On the render modes you want to use LightWorks or RedSDK set the Rendering Type accordingly.