Would you mind to describe more in detail your scene set-up? A screen-shot of the Forest Color
map configuration would be handy too. Take in mind, in case you're using proxies, that as mentioned in our on-line reference guide
:"To use Map and Tint by Element, you must use VRay or Mental Ray and standard meshes as Custom Objects, other type of objects as proxies are not supported."
If that's the case, setting the Variation
slider to Item should fix it.
Also, please feel free to send us
your scene to check it here.