Ok, I've seen how you can apply an FX to all the children in the nest by using the pre/post toggle switch in the FX. But I'm still confused about how the nest works when applying the 2D shadow and glow to the parent. Here's the example, working from a new project:

1. To tracks 1 - 4, add a generated media color, one to a track. Use yellow, green, blue and orange.
2. In each tracks track motion dialog, size them to 240 x 160 and put them in a different corner of the screen.
3. Now add a new track one, select all the tracks below it, and make them all a child of the new track 1.
4. In the parent motion dialog, turn on 2d glow. NOTHING HAPPENS. Now add, an additional track 6 below all the child tracks, and drop a white generated color. Now you can see the glow on the child tracks. HOWEVER, THE GLOW IS EDGED DIFFERENTLY AROUND ALL THE CHILD OBJECTS.
5. Turn on the 2d shadow in the parent motion dialog. You get a nice 2d shadow around all the children, and it is offset exactly the same around each child - down and to the right.

So, what I'm confused about is:
1. Why do you have to have media below all the children for the glow to show up?
2. Why does the glow go around each child object with different offsets?