This material is a simple specular material with tabulated medium, it's technically not different from other liquids from the database, for instance. It works for ages, so I would suspect something else.
Here it looks like we have the reflection but absorption is negligible.
Check if your scene scale is correct, as the glass pane must have a thickness of a few millimeters in order to appear brown. If the thickness is much lower, it may appear as in your picture. As I don't know C4D, I'll let other help you with scale checking.
You can make a test : add to your scene a 10cm cube or sphere made of this material :
http://www.indigorenderer.com/materials/materials/10. If it does not appear greenish, this means you have a scale problem.
Etienne