LoadLevel() cause some problems with lighting and navmesh

Hi, I have done the Unity tutorial “Survival Shooter”.
Now I want to add some kind of menuscreen. This screen loads my gamescene (with OnClick()-methode on a UI-Button)

public void Start()
    {
        Application.LoadLevel("Level 01");
    }

So now here comes the problem:

If I load the scene from my menuscene, the lighting is completely different, and the monsters dont walk around.

Console : NavMesh asset format has changed. Please rebake the NavMesh data

If I play the gamescene it all works fine.

I am using Unity 5.0.0f4 Personal 64bit DX 11 on Windows

Change The build Scene in the proyects to build for you proyrct not for the default proyect