Ubuntu 16.10 x64 geforce gtx 1070
Windows 7 x64 geforce gtx 960
Broken: 2.78a x64 win & lin, current buildbot 62a2ed9 win x64
Short description of error
"Is glossy ray" will not switch the color of the emission shader on the sphere in the following simple setup of a cube with glossy shader and a plane with diffuse shader:
Turning off "Glossy" in the ray visibility settings works as expected, though.
Exact steps for others to reproduce the error
Open attached .blend: