Photon multiplayer game working in editor but not in build.

There are two problems I appear to be having at once.

Problem #1: I made a script to scatter gameobjects throughout a set radius, and it works beautifully in the editor, but does absolutely nothing in the build. If I start a photon room in the editor, and then join it in a build, however, the objects will be there in the world, but if I start a room in the build they simply do not spawn. Here is the script:

 using UnityEngine;
 using System.Collections;
 
 public class SpawnItems : MonoBehaviour {
     
     public GameObject Item;
     public int spawnNum = 12;
     public int negX = -155;
     public int posX = 155;
     public int negZ = -155;
     public int posZ = 155;
 
     void spawn()
     {
         for(int i = 0; i <spawnNum; i++)
         {
             Vector3 ItemPos = new Vector3(this.transform.position.x + Random.Range(negX, posX), this.transform.position.y + Random.Range(0.0f, 0.0f), this.transform.position.z + Random.Range(negZ, posZ));
             GameObject ItemGO = (GameObject)PhotonNetwork.Instantiate(Item.gameObject.name,ItemPos,Quaternion.identity, 0); //PhotonNetwork.
             
         }
     }
     // Use this for initialization
     
      void OnCreatedRoom()
  {
         spawn();
     
  }
     
     // Update is called once per frame
     void Update () {
     
     }
 }

Problem #2: I also made a (totally unrelated) script which is placed on an object so that it would move along the Terrain at a raycast hit sent from the center of the player's view. It was meant to be a building system, like in games like rust, where a transparent preview of an object being built exists where the object will be placed, then, when the player clicks, it spawns the object in its place. Again, it works like a charm, but only in the editor. In the built edition of the game, the ghost object (the preview) does not move at all. Here is the script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlaceThingC : MonoBehaviour {
 
 
 public Transform prefab;
 public float speed = 1.0f;
 public Camera PlayerCamera;
 
 
 void  Start (){
     
 }
 
 void  Update (){
     
     Ray ray = PlayerCamera.ScreenPointToRay(Input.mousePosition); //camera.main.ScreenPointToRay
     RaycastHit hit;
     Vector3 euler = this.transform.rotation.eulerAngles; //Quaternion.Euler(this.transform.rotation.x, this.transform.rotation.y, this.transform.rotation.z);
     
     if (Physics.Raycast(ray, out hit,Mathf.Infinity)) {
         if(hit.collider.tag == "Terrain"){
             
             if (Input.GetKey(KeyCode.E)) {
                 transform.Rotate(Vector3.up * speed * Time.deltaTime);
             }
             
             if (Input.GetKey(KeyCode.Q)) {
                 transform.Rotate(-Vector3.up * speed * Time.deltaTime);
             }
             
             transform.position = hit.point;
             
             if (Input.GetMouseButtonDown(0)) {
                 PhotonNetwork.Instantiate (prefab.gameObject.name, hit.point, Quaternion.Euler(euler.x,euler.y,euler.z), 0);
                 this.transform.gameObject.SetActive(false);
             }
         }
     }
 }
 
 
 
 [PunRPC]
 void  Test (){}
 }

Thanks in advance to anyone who bothers to help me out here.