Billboard particles don't play with cycles ?

Hi everyone !

I wanted to play a bit with Blender. Usually when I do that, I run into trouble.

This time I couldn;t get billboard particles to render with Cycles… I can see them in the viewport alright, I can have them render with old BI, but impossible to have them display anything with Cycles…

Is there a trick ? Or is that simply not working ?

Looks like nothing has changed: https://developer.blender.org/T37912

Oh dear… These things annoy me.