Shadows don't render correctly using renderlayers

Hi,

Pretty sure its something super easy but I just can’t figure it out and all the other posts I look at point to how to remove shadows, not add them.

The scene: I have 3 renderlayers combined using alpha over. I have a plant in a pot sitting on a table with chairs around it. The table and chairs are on one layer, the tree on another, and the walls and floor on the third. The shadows work fine on each renderlayer separately, but they don’t cross over to the composite. So the tree’s shadow doesn’t hit the table and the table and chairs don’t cast shadow on the floor. As far as I was able to tell it should happen automatically, but I could be wrong.

I’m using 2.72b Hash: 9e963ae

Thanks!

Could you share the file?