Shadow shader circle artefacts?

I'm having problems with shadows in this scene. The point light draws "circles" over the objects in the scene - and also in the exported player.

Disabling the shadows eleminates the problem, but I need shadows in there. Any clue what's wrong?

Here you can see it in motion: http://www.decane.net/martin/unity/intro/Intro.html

Martin

 

pretty well known behavior, documented in various threads.
Basically you can elimiate it by adjusting the bias to meet the requirements of the light - object distance.
it will not work on general distance objects thought, so you best make it meet the static worlds requirements as dynamic objects aren't large enough and flat enough normally to show the issue visibly.