I just wrote a bug report to the Unity team about problems with the halo effect for lights in my Unity4.1 installation (windows 32).
I also write the topic here in order to give people a work around:
BUG:
- Start e new project, even with no assets to be faster
- add a point light
- check “Draw Halo”: nothing happen in both Scene and Game windows!
WORKAROUND: - Select Component/Effect/Halo: now you have the halo (as expected)
- If you want remove the component you just added
- Now the Halo check box (point 3) works. Try check and uncheck…
- also the other lights now have their halo check boxes working…
Nothing similar happened in unity 3.5
Hope this will help someone, I did spent more then an hour checking…
I also found this:
What happened with halo lights in Unity 4.1? - Questions & Answers - Unity Discussions