Hi there,
I have the Maxwell Render suite and I've never applied Emitters using the Studio, only the plugin (you can still use the plugin with the suite). I find that for what I'm trying to achieve, that I don't need to use the Studio for Emitters.
To get a 'bulb' to emit; I apply a material to the component, then using the Maxwell plugin within SketchUp I select 'emitter'. I then choose the wattage etc.
To illustrate the beam of light against a wall, I create a small sphere, again apply a material to it and using the Maxwell plugin, I choose IES Emitter. Then I select one of the IES files (these would have downloaded with Maxwell Render and can be found in the Maxwell folder in your C Drive).
Hope this helps!
Anita