As of beta 38, the "ambient" keyword no longer works in radiosity scenes.

*IT'S NOT A BUG, IT'S A FEATURE*.

Honestly.

For legacy scenes using a "#version 3.6" statement, nothing has changed; 
ambient should work just as it did before.

Otherwise, radiosity scenes will now be rendered as if "ambient_light" 
had been set to 0, i.e. materials with an "ambient" parameter will /not/ 
seem to emit light anymore.

To model light-emitting surfaces, a new finish parameter "emission" has 
been added, which will do just the same as "ambient" previously did, 
except that it is unaffected by the global ambient_light setting.


It is also recommended to use the "emission" keyword in non-radiosity 
scenes for anything you want to look like glowing, and use "ambient" 
only to model local ambient illumination, so that transition to using 
radiosity is straightforward.

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