Camera Lock on GUI

I've made a Pause menu for my mini game, but for some reason when i hit escape for the first time, the camera wont stop moving.Its only after i go back into the game and press it again that it works. I'm using a Free camera from the assets store but i also get this problem when using the FPS Controller.

I'm using:

    canvas.gameObject.SetActive(true);
         Time.timeScale = 0;
         Player.GetComponent<FirstPersonController>().enabled = false;
         Cursor.visible = true;
         Screen.lockCursor = false;



     }
     else
     {
         canvas.gameObject.SetActive(false);
         Time.timeScale = 1;
         Player.GetComponent<FirstPersonController>().enabled = true;
         Cursor.visible = false;
         Screen.lockCursor = true;

I've also tried using cursor.lockstate but that doesn't work either.

As far as i can tell there are no conflicting scripts either.

Any help would be greatly appreciated!.