the infamous alpha over node

I have struggled with combining multiple render layers for quite some time now, and I am thoroughly vexed. I never can get one to appear on top of another. I have attached a simple example file in which I try to combine a light saber with a simple background. The result is that the light saber appears but the background doesn’t. I would be very appreciative if someone took a look at this .blend and told me what I was doing wrong.



alpha over trouble.blend (192 KB)

I just tried your file and it looks O.K.
I activated both scene layers for rendering, pressed the Do Composite button and that’s it.


ditto on the ‘Do Composite’ - I kept trying to figure out why nothing was coming out at all…

Thanks for the help.