Mouse Movement In Pause Menu

Hey guys! i have a problem. When i go into my pause menu i get the mouse showing, but i gets stuck in the middle of the screen. when i playtest in Unity i can use the mouse, but as soon as i do it as a builded version, it gets stuck :(

Here is my code for the pausemenu:

using UnityEngine; using System.Collections;

public class Pause : MonoBehaviour {

 private ShowPanels showPanels;
 private bool isPaused;
 private StartOptions startScript;

 void Awake()
 {
     showPanels = GetComponent<ShowPanels> ();

     startScript = GetComponent<StartOptions> ();
 }
 
 void Update () {

     if (Input.GetButtonDown ("Cancel") && !isPaused && !startScript.inMainMenu) 
     {
         DoPause();
     } 
     else if (Input.GetButtonDown ("Cancel") && isPaused && !startScript.inMainMenu) 
     {
         UnPause ();
     }
 
 }
 
 public void DoPause()
 {
     isPaused = true;
     Time.timeScale = 0;
     showPanels.ShowPausePanel ();
     GameObject.Find("Player").GetComponent<FirstPersonController>().enabled = false;
     Cursor.visible = true;
 }


 public void UnPause()
 {
     isPaused = false;
     Time.timeScale = 1;
     showPanels.HidePausePanel ();
     GameObject.Find("Player").GetComponent<FirstPersonController>().enabled = true;
     Cursor.visible = false;
 }

}