When working in C4D and Octane you may run into some issues with emissive or refractive materials (like glass). This is a bug we are working to fix on our end but in the mean time here's a quick fix:
For the transparent glass, set the refraction color to white.
For the various Light materials, make the material emissive and then set the color/temperature to whatever works best for your scene.
For more information, check out this documentation: http://www.aoktar.com/octane/OCTANE%20HELP%20MANUAL.html?index.html.