Wow, that's very fast service!
But as I had pointed the program to LuxRender.app earlier, it doesn't ask again and I don't know how to clear the preferences. Eventually, it would be nice to be able to set the path to LuxRender in the settings menu as some people may be running both a stable version and a development build.
The material panels shows a bit more information now; it displays the name of the one material I'm using.
It seems the only problem with the scene was indeed that there was no light source. I hope exporting the sun settings is high up your priority list. I have a couple more comments, but as this is a work in progress I'll save them for later.
Thanks for working on this and when you would like some more testing to happen, just ask.