Why can't I click the button in my GUI anymore or more likely sometimes only, after I pressed play

Questions & Answers
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1

So I was making a game project for my subject game design 2, it is a space shooter game. After completing it all, I tried playing it. It works fine as I expected but then when I tried to play it again, after pressing play when I hover my mouse to the start button. I can’t click it anymore, I can’t shoot the bullets from my space ship and the movement on my enemies won’t initiate since I have put a condition in that script that the enemy movement and shooting of my ship will only work after I clicked the start button.

I already double checked all my scripts and there were no errors or what. I tried importing it all again and restarting unity it’s still the same. It’s a 50/50 chance of it letting me click it all the way to the 3 scenes or levels I made.

Here is the script for my UI

using UnityEngine;

public class UIManager : MonoBehaviour
{
    bool checkStart;
    bool startEnemyMovement;
    bool buttonClicked;

    void Start()
    {
        checkStart = false;
        startEnemyMovement = false;
        buttonClicked = false;

        // disable the enemyscript so that the enemy won't move immediately
        GameObject[] enemies = GameObject.FindGameObjectsWithTag("Enemy");
        foreach (GameObject enemy in enemies)
        {
            enemy.GetComponent<EnemyScript>().enabled = false;
        }
    }

    private void FixedUpdate()
    {
        if (startEnemyMovement && buttonClicked)
        {
            GameObject[] enemies = GameObject.FindGameObjectsWithTag("Enemy");
            foreach (GameObject enemy in enemies)
            {
                enemy.GetComponent<EnemyScript>().enabled = true;
            }

            startEnemyMovement = false;
            buttonClicked = false;
        }
    }

    private void OnGUI()
    {
        if (!checkStart)
        {
            GUI.Box(new Rect(310, 100, 300, 200), "SPACE SHOOTER");

            // Create a "START" button
            if (GUI.Button(new Rect(382, 150, 150, 50), "START"))
            {
                startEnemyMovement = true;
                checkStart = true;
                buttonClicked = true;

                // enable the ship to shoot when the "START" button is clicked
                GameObject playerShip = GameObject.FindGameObjectWithTag("Player");
                if (playerShip != null)
                {
                    MyShipBulletScript shipBulletScript = playerShip.GetComponent<MyShipBulletScript>();
                    if (shipBulletScript != null)
                    {
                        shipBulletScript.EnableFiring();
                    }
                }
            }

            // Create an "EXIT" button
            if (GUI.Button(new Rect(382, 220, 150, 50), "EXIT"))
            {
                checkStart = true;
            }
        }
    }
}
2

If you restart the game without restarting play mode but instead by pressing “EXIT”, your checkStart variable is still true, thereby hiding the UI. In this block

// Create an "EXIT" button
            if (GUI.Button(new Rect(382, 220, 150, 50), "EXIT"))
            {
                checkStart = true;
            }

you likely need to set the variable to false?