What am I missing so Blender can render fire

[omgold]

Problem is the transparent background. Same as here:

Cycles strange render behavior!

Hello I encountered a strange render behavior in Cycles. I conect a emission node in the volume. Thats the material. I enable transparent in Render>Film. I render this setup in the preview render. Every thing is OK. Now I render it, and there ist nothing I see. And restrict rendering of the Object is off, so you shuold see it. When I put a plane under a portion of the cube, it renders the cube only where the plane is!? Here a image of the setup and result. [grafik] What is the problem? Tha…