For your information, there is a problem with Scattering medium node and emitter (blackbody or texture).
It's not possible to connect an emitter to a Scattering medium in the node editor as it should be. Even if the specular material is not connected or edited via a MixMaterial, it's not possible to connect an emitter to a medium in the node editor.
It's possible to add an emitter to a scattering medium inside the attributes panel if you edit directly the specular material but not if you edit the specular material inside a MixMaterial. Anyway, changing the parameters of the emitter connected in this way never refresh the live viewer. You need to refresh manually after every modification. After connecting the emitter via the attributes panel, it's visible and possible to edit in the node editor.
This works fine in standalone.
Well... this is not very important but good to know. Hope this will be usefull to someone.

EDITED: title of the topic