Two Different Box Colliders Aren't Colliding

I've taken a little break from a project, but have recently updated to Unity 5.3.5 from 5.3.3 (Interestingly It had some kind of warning about updating - I can't remember what it was specifically).

Onto the problem, I created an empty game object with a box collider2D and put a script on it to destroy game objects. This works beautifully on all colliders that have been in the project before the update, but when I create a new object with a box collider2D on it - it doesn't collide at all! It doesn't even recognize that it's colliding. Yes I have checked the collision matrix as well, and it's working as expected.

Here is the destroyer collider's script (that destroys the out of bound objects):

 using UnityEngine;
 using UnityEngine.SceneManagement;
 using System.Collections;
 
 public class Destroyer : MonoBehaviour
 {
     int deathTime = 1;
 
     void OnTriggerEnter2D(Collider2D collision)
     {
         if (collision.gameObject.tag == "Player")
         {
             StartCoroutine(DeathAfterSec(deathTime));
         }
 
         Destroy(collision.gameObject);
 
         if(collision.gameObject.tag == "Untagged")
         {
             Debug.Log("planksucks");
         }
     }
 
     IEnumerator DeathAfterSec (int deathTime)
     {
         yield return new WaitForSeconds(deathTime);
         SceneManager.LoadScene("Scene2");
     }
 }

Yes - I am trying to destroy the object named Plank ;p