Now this is weird, I’ve always used these methods: http://wiki.blender.org/index.php/Tutorials/Textures/Use_Alpha_for_Object_Transparency, and they’ve worked fine… until today. This is the result that I’m getting now:
As you can see the front plane is transparent for the sky but opaque for the plane behind.
I checked all my settings and they seem to be ok… this is really frustrating.
Any help is welcome