Problem with Reflections

[MrFurious]

I've noticed a problem with reflections when using emitters. I've included a sample scene which demonstrates this. There is an emitter, a floor, sphere and cube object. The emitter is setup to be totally invisible except for the emitted light itself using the polyside node, and the floor, cube and sphere have reflective surfaces. Upon first launch the scene does exactly what you would expect:- you see the emitted light only reflected in the cube and sphere but not the emitter polygon itself.

Problem is when the reflective surfaces have roughness, even .01%, the emitter polygon suddenly becomes visible in reflections.

Scene File is here: http://www.mediafire.com/download/coxhd ... ctions.zip