> Is there any solution to this? Should I put a light-source outside each
> window? Should I make a window an opaque ambient object when I'm not
> looking at it?

There are several things you should check:
1. Is the max_trace_level high enough, so that radiosity sampling will
actually pass through the windows?
2. Perhaps recursion_limit is too low and the light thus isn't propagated
far enough into the scene?
3. Is count high enough? The higher it is, the more likely it is to "catch"
bright objects?
4. How bright is your skysphere and lightsource?
5. How bright did you set "brightness" in the radiosity-block?

I've used radiosity in my latest image as well, "Prepared for company". I've
got a light shining through a window, but radiosity does the main job of
keeping the room brighter than black. I'm not sure what you're doing wrong,
but there's definitely something set up incorrectly if your radiosity
doesn't get through the window. A trick I did to keep max_trace_level low:
during radiosity gathering, I commented all windows out. I then rendered a
second pass with all windows in place. Two side-effects: the max_trace_level
doesn't need to be that high to get through the windows, and there are no
radiosity samples on the windows, which don't need it most of the time
anyway.

Regards,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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