Sorry, i have not replied before because i was wanting to create a test scene for you, but we have been very busy all the day.
You must assign the texture map in the Forest object ->Material->Color Tint (see the image of the above post), not in the "Forest Color" plugin. The map of Forest Color defines the default color of the item, not the tint applied over the global object as the Tint map does.
The tint properties of the Forest Object are also duplicated in "Forest Color". You can use different tint options for a specific material, turning off the "Override" checkbox.