When I first saw that, I thought it really looked like a bug, but then I
started thinking about why they would do that.  It's obvious it was
intentional, since diffuse still works.  The reason, I think, is because
you might want to use shadowless lights to simulate radiosity. 
Radiosity is typically a diffuse effect, so just having diffuse work
should do a pretty good job.  If hilights worked and you had a bunch of
shadowless fill lights, you'd end up with a bunch of bright spots all
over object, making it appear like they are reflecting light from
several light sources without casting any shadows.

So it's probably not a bug.

-Mike

Nieminen Mika wrote:
> 
>   I just discovered a strange side effect with the 'shadowless' lights.
>   Try this:
> 
> camera { location -z*5 look_at 0 angle 35 }
> light_source { <100,100,-100>,1 }
> sphere { 0,1 pigment { rgb <1,0,0> } finish { specular 1 } }
> 
>   A regular sphere with a highlight.
>   Now apply the keyword 'shadowless' to the light source.
>   The highlight disappears!
>   This works equal in both pov3.0 and 3.1. It also works if the highlight is
> a phong highlight instead of a specular one.
>   Is this a bug? Should I report to povray.bugreports?
> 
> --
> main(i){char*_="BdsyFBThhHFBThhHFRz]NFTITQF|DJIFHQhhF";while(i=
> *_++)for(;i>1;printf("%s",i-70?i&1?"[]":" ":(i=0,"\n")),i/=2);} /*- Warp. -*/

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