Group object emitted as particles renders only as lines

Hi all,
I’ve attached a simple test of a plane particle emitter emitting group objects. The group object consists of several basic mesh among which the cube is a particle emitter itself. Rendering a frame I can see the particle emitted by the cube only if I set Line or Billboard in physic tab. Rendering as Halos, Object or Group object does not render anything, or in the caso of Halos.
In the blend file you can switch to Object (in this case sphere.002 is already set) or Halos in the Physic tab for the cube to see the problem.

Many thanks in advance

Blender: 2.56.0 r33949
OS: Ubuntu 10.10

Attachments

test.blend (785 KB)

Cube object belongs to Group, so I think it cannot emit itself. Thats my guess.

Thanks for your response jawra, however it seems that cube can emit if you set particles to lines or billboard. It’s just halos and Object that does not work