Unity 3.0 bug ? Web player build fails but exe works well

hi,

After upgrading from 2.6 to 3.0, my main scene fails to start in web player mode.

It works well in edit mode and standalone mode, but not in web player mode. In web, it only shows a skybox, no login dialog window is display.

My main scene is very simple: there is only a camera with a starter.cs attached. The starter is also simple:

void Start()
{
GameStateManager.init(); //starts the game and show a login dialog

}

Anybody knows how to solve this?

Thanks.

Find the reason. It seems Unity 3.0 web player does not support .net Mutex class. My code got stuck on this line:

Mutex mt = new Mutex();

Is there any reason Unity 3.0 removed this support?