when i attach gameobject i don't move

Hello all,

i'm learnig unity from scratch and at this link you can see waht i make with a lot of effort :)

Istructions:

1.with 20click on a tree, the tree will fall

2.with 20click on a falled tree you'll get 3 wood chunks

3.with click on objects you'll carry them

4.with "y" (keyboard) you will let them fall.

5.movement with WASD :)

now, i'm facing a REALLY strange issue: If i grab the short wooden plank, i can move free but if i grab the AXES ...my charachet get stucked. The character can move only if i let them fall hitting y on keyboard... Even if i grab the wooden chunks generated from trees i can move...

Anybody have a idea of what happening??

Grabbing Script (JS)

 #pragma strict
 var touched : boolean;
 var presa :boolean;
 var ply: GameObject;
 function Start () {
 
 }
 
 function Update () {
 touched = GameObject.Find("player/Main Camera").GetComponent(raycaster).TouchSomething ;
 if (presa==true) { po(); }
 
 if(Input.GetKeyDown("y") )
             {
             
             
             this.transform.position = transform.position;
             //this.transform.position.y = transform.position.y;
             //this.rigidbody.AddForce (10, -10, 10);
             presa=false;this.transform.parent = null;}
 }
 
 function po() {
      this.transform.localPosition = new Vector3(0.18f,0.08f,1.0f); // centering the sword handle
             this.transform.localRotation = Quaternion.identity; //must point y local, so reset rotation
             this.transform.localRotation = Quaternion.Euler(-17, 259, 36); //and rotate the sword accordingly
 }
 function OnMouseDown() 
 { 
 ply = GameObject.Find("player/Main Camera");
 this.transform.parent = ply.transform;
 if (touched == true) 
     {//transform.position.y=42;
     //this.rigidbody.AddRelativeForce(0,500,0); 
         presa=true;
     }}