ThreeJS OBJLoader + MTLLoader - Model appearing black

Question

I am having some troubles loading colors onto one of my models. I am using an OBJloader and an MTLloader. The .obj and .mtl files are generated from an export from blender (there is no texture which uses .png/.tga file). MTL files loads perfectly onto other models, but for some reason this model only appears black.

Here is the MTLLoader I am using: https://github.com/mrdoob/three.js/blob/master/examples/js/loaders/MTLLoader.js

Here is the .mtl file that does not work:

newmtl Material_1
Ns -1.960784
Ka 0.000000 0.000000 0.000000
Kd 0.000000 0.000000 0.000000
Ks 0.194444 0.194444 0.194444
Ke 0.000000 0.000000 0.000000
Ni 0.000000
d 1.000000
illum 2

newmtl Material_2
Ns -1.960784
Ka 0.000000 0.000000 0.000000
Kd 0.000000 0.000000 0.000000
Ks 0.986111 0.986111 0.986111
Ke 0.000000 0.000000 0.000000
Ni 0.000000
d 1.000000
illum 2

newmtl Material_3
Ns -1.960784
Ka 0.000000 0.000000 0.000000
Kd 0.000000 0.000000 0.000000
Ks 0.187500 0.187500 0.187500
Ke 0.000000 0.000000 0.000000
Ni 0.000000
d 1.000000
illum 2

newmtl Material_4
Ns -1.960784
Ka 0.000000 0.000000 0.000000
Kd 0.000000 0.000000 0.000000
Ks 0.263889 0.263889 0.263889
Ke 0.000000 0.000000 0.000000
Ni 0.000000
d 1.000000
illum 2

Here is an example of a .mtl file that works perfectly:

newmtl car_body
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.693878 0.084748 0.084748
Ks 0.108100 0.108100 0.108100
Ke 0.000000 0.000000 0.000000
Ni -1.000000
d 1.000000
illum 2

newmtl car_body_1
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 1.000000 1.000000 1.000000
Ks 0.100000 0.100000 0.100000
Ke 0.000000 0.000000 0.000000
Ni -1.000000
d 1.000000
illum 2

newmtl engine_grille
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.000000 0.005952 0.051020
Ks 0.117000 0.117000 0.117000
Ke 0.000000 0.000000 0.000000
Ni -1.000000
d 1.000000
illum 2

newmtl glass
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.282521 0.704611 0.948980
Ks 0.100000 0.100000 0.100000
Ke 0.000000 0.000000 0.000000
Ni -1.000000
d 1.000000
illum 2

newmtl headlight
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.847328 0.944020 1.000000
Ks 0.100000 0.100000 0.100000
Ke 0.000000 0.000000 0.000000
Ni -1.000000
d 1.000000
illum 2

newmtl rear_lights
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.847328 0.944020 1.000000
Ks 0.100000 0.100000 0.100000
Ke 0.000000 0.000000 0.000000
Ni -1.000000
d 1.000000
illum 2

newmtl wheels
Ns 96.078431
Ka 1.000000 1.000000 1.000000
Kd 0.142857 0.142857 0.142857
Ks 0.100000 0.100000 0.100000
Ke 0.000000 0.000000 0.000000
Ni -1.000000
d 1.000000
illum 2

Here is the JavaScript:

var bird = new THREE.Object3D();
var mtlLoader = new THREE.MTLLoader();
mtlLoader.load( 'bird.mtl', function( materials )
{
   var objLoader = new THREE.OBJLoader();
   objLoader.setMaterials( materials );
   objLoader.load( 'bird.obj', function ( object )
   {
      bird.add( object );
   });
});
scene.add( bird );

Anyone got any idea why the upper .mtl file does not load properly, and only appears black?

Joakim