giles masked textures prob

Is there a special feature I got to activate to make masked textures cast masked shadows? Thought it would do that automaticly, But after reinstalling version 1.36, it renders the shadows fully opaque, ignoring the masked textures. The Textures are displayed correctly (masked).

Nevermind. I think I found the reason why. Texture Blend Mode of the masked texture must be multiply, not alpha.