I'm just curious about this...
Imagine a comp with two solids - each solid being less than full comp size, and positioned so they partially overlap each other.
The rearmost solid is selected.
You're using the selection tool to click / select solids in the comp window.
If you try to select the top solid by clicking on it where the top solid overlaps the rearmost solid - it won't select.
Is this intended behaviour? Why?