Yes it is.. I change it to several different variants. Basically so far what I found is that if my underlying material is a mix material and then I change the ecosystem scaling, the problems happens. I found it best to the following steps.. 1. Apply distribute map as color map to terrain 2. Change to ecosystem and using distribution map as map to distribute the ecosystem. Test and every thing is ok here 3. Change the underlying material to a mix material that is distributed by my distribution map. Test and every thing is ok here 4. Adjust the scaling of ecosystem objects Test and problem occurs.. The distribution map is simply a white square with a line down the middle for the road