Particles & tracking

I have set up 3 billboard objects, each on a half-sphere. Each of them is set to track the camera, so the camera sees them face-on as spheres, not half-spheres.

I have grouped them and then made the group be the subject of a particle system.

The problem is that the particles spheres do not track the camera. Instead, they all face right and tilt with the normal. I can’t seem to find any way to tell the particles to track the camera as the originals do. If I change the tracking orientation of the originals, the particles just keep on facing right.

Thanks for any clues.

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