SetActive Not Responding

Anyone have any other ideas? I've tried these and sadly they don't seem to work.

I've been having some trouble with this for a while. I have a test game where I have a player going around picking up spheres. I would like to have the spheres reappear in the same place again after 3 seconds. I'm currently using SetActive(false)on a player script so the sphere can be picked up and counted. In a pickup script, I have a coroutine set up to set the sphere back to active after 3 seconds. Problem is my spheres are never set back to active after 3 seconds. I read on another post (http://answers.unity3d.com/questions/390990/gameobject-setactive-not-reactivating.html) you need to set up a parent game object with child game objects for the set active to pull from but I have no idea where to start on setting that up in my code or if it will work for my situation.

Any suggestions? Here's my code:

Player script:

 public class ThirdPersonController1 : MonoBehaviour {
     
     //Variables for movement
     public float movementSpeed = 5.0f;
     float verticalVelocity = 0;
     public float jumpSpeed = 20;
     CharacterController character;
 
     //Variables for Pickup and Counter
     public GUIText countText; //shows how many spheres have been picked up
     public GUIText winText; //shows message when you win the game
     private int count; //counting the spheres as they are picked up
 
     public bool guiIsOn = false;
 
     //bool isPickedUp = false;
 
     void Awake()
     {
         Time.timeScale = 1;
     }
 
     // Use this for initialization
     void Start () 
     {
         count = 0; //starts count at 0
         SetCountText(); //called method to add spheres as they are picked up
         winText.text = "";  //empty at game start
     }
     
     // Update is called once per frame
     void Update () 
     {
 
         //Get the Character Controller//
         CharacterController character = GetComponent<CharacterController>();
 
 
         //Character Movement//
         float FBSpeed = Input.GetAxis("Vertical") * movementSpeed; //forward and back movement
         float LRSpeed = Input.GetAxis("Horizontal") * movementSpeed; //left and right movement
         
         verticalVelocity += Physics.gravity.y * Time.deltaTime; //jump velocity aka how high you jump
         Vector3 speed = new Vector3(LRSpeed, verticalVelocity, FBSpeed); //get the Vector for the speed
         speed = transform.rotation * speed;  //storing the speed
         character.Move(speed * Time.deltaTime); //get the character movement speed
 
 
         //Check to see if the Character is on the ground and Jump is pressed
         if (Input.GetButtonDown("Jump") && (character.isGrounded))
         {
             verticalVelocity = jumpSpeed;
         }
     }
 
     //when the player hits the game object labeled "Pickup"
     //the game object will deactivate and disappear
     void OnTriggerEnter(Collider other) 
     {
         if(other.gameObject.tag =="Pickup")
         {
             other.gameObject.SetActive(false);
             count = count + 1; //increases number of spheres picked up
             SetCountText();   //called method to add spheres as they are picked up
 //            isPickedUp = true;
 //            Debug.Log ("Picked up!");
 //            StartCoroutine(RespawnItem());
         }
     }
 
     //Respawn the pickup
 //    IEnumerator RespawnItem()
 //    {
 //        if(isPickedUp)
 //        {
 //            int respawnTime = 3;
 //            yield return new WaitForSeconds(respawnTime);
 //            gameObject.SetActive(true);
 //            Debug.Log ("Spawned!");
 //        }
 //
 //        isPickedUp = false;
 //    }
     
 
     void SetCountText()  //shows the number of picked up spheres in the GUI
     {
         countText.text = "Count: " + count.ToString();
 
         //if all 7 spheres are picked up show win text
         if(count >= 7)
         {
             winText.text = "You Win!";
             Debug.Log ("hey!");
             Time.timeScale = 0;
             guiIsOn = true;
             OnGUI();
         }
     }
 
     void OnGUI()
     { 
         if (guiIsOn)
         {
             // Make the first button. If it is pressed, Application.LoadLevel(Application.loadedLevel) will be executed
             if(GUI.Button(new Rect(Screen.width/2-40, Screen.height/2+10,80,20), "Play Again?")) 
             {
                 Application.LoadLevel(Application.loadedLevel);
             }
         }
     }
 }

Pickup script:

 public class Pickups : MonoBehaviour 
 {
 
     //Variables
     bool isPickedUp = false;
 
 
     // Use this for initialization
     void Start () 
     {
     
     }
     
     // Update is called once per frame
     void Update () 
     {
     
     }
 
     void OnTriggerEnter(Collider other) 
     {
         if(other.gameObject.tag =="Player")
         {
             isPickedUp = true;
             Debug.Log ("Picked up!");
             StartCoroutine(RespawnItem());
         }
 
         isPickedUp = false;
     }
 
     //Respawn the pickup
     IEnumerator RespawnItem()
     {
         if(isPickedUp)
         {
             int respawnTime = 3;
             yield return new WaitForSeconds(respawnTime);
             gameObject.SetActive(true);
             Debug.Log ("Spawned!");
         }    
 
     }
 }