Yafray won't render transparency

I’ve been using Blender for four years and just started using YAFRay last week. For some reason, though, the renderer won’t do transparency!

here’s what i’ve done with tests:
A try at glass that didn’t work and…
Another try with photons that STILL went wrong.

help, please?

Is rayTransp on? What is the alpha? We need more info.

Here are the properties for the white sphere:

Tell me what’s wrong.