Blender never render my model suddenly

Create an Underground Subway Scene – Part 1 of 2 | Blender Guru
↑I have been practicing Blender with this tutorial. I use it everyday, though some small time.
But suddenly Blender became not to render my tunnel as I expected.

wrong render result

↑Why? Blender renders only this layer whatever I did.
I needed some days to find the reason.

render setting

↑You can set layer to render here.
I’ve never set nor visit here, so I must have enter the shortcut key to render only this layer?

set layers to render

↑Anyway I set all layers to be rendered, then Blender shows as before :

right render result

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