@, Simply cause the sense for me of buying something “reday to use” is… to use it without chnaging 100 things, but you are right that ue4 is changing from version to version… so yeah maybe something is wrong in the setup.
@Havoc Thanks for your tip but i just noticed that the speedtree shader / material is alreday configured with the two sided node… so it was already assigned…
Hmmm i’m really freaking out 
i have no idea what this issue is about …