Debian AMD64, fglrx-driver
Broken: 2.72 and later
Short description of error
All activated scene layers (under the Render Layers tab) should be rendered, but only the scene layers set in the 3D-viewport are rendered.
Exact steps for others to reproduce the error
Here is a .blend file:
Press F12 to render.
Two objects are located on two separrate scene layers. Both layers are activated, so both objects should be rendered.