Saving/Loading PlayerPrefs only works in the editor

Question

I'm creating a game which stores a few variables using PlayerPrefs. It saves and loads the PlayerPrefs perfectly fine while testing in the editor, however when I build it to WebGL or Unity Web Player, both of them fail to save or load (I don't know which fails) and WebGL throws an exception on loading. Heres the c# script. Loading and saving are in their own procedures: loadData() and saveData()

public decimal money = 0;
public Text moneyTxt;

public Modal modal;

public AudioSource clickSFX;

private bool hasLoaded = false;

public Prog lemonadeStand;
public Prog newspaperDelivery;
public GameObject newspaperDeliveryBuy;
public Prog carWash;
public GameObject carWashBuy;

void Start () {
    askToLoad ();
}

// Update is called once per frame
void Update () {
    moneyTxt.text = "$" + money.ToString ("F2");

    if (Input.GetButtonDown ("Fire1")) {
        clickSFX.Play();
    }
}

void OnApplicationQuit() {
    if (hasLoaded) {
        saveData ();
    }
}

void saveData () {
    PlayerPrefs.SetString ("SaveMoney", money.ToString ());

    PlayerPrefs.SetFloat ("LemonadeStandMultiplier", lemonadeStand.multiplier);
    PlayerPrefs.SetFloat ("LemonadeStandUpgradeCost", lemonadeStand.upgradeCost);
    PlayerPrefs.SetInt ("LemonadeStandHired", lemonadeStand.hired ? 1 : 0);
    PlayerPrefs.SetFloat ("LemonadeStandPercentage", lemonadeStand.percentage);
    PlayerPrefs.SetFloat ("LemonadeStandTimeMultiplier", lemonadeStand.timeMultiplier);

    if (newspaperDelivery.transform.parent.gameObject.activeSelf) {
        PlayerPrefs.SetFloat ("NewspaperDeliveryMultiplier", newspaperDelivery.multiplier);
        PlayerPrefs.SetFloat ("NewspaperDeliveryUpgradeCost", newspaperDelivery.upgradeCost);
        PlayerPrefs.SetInt ("NewspaperDeliveryHired", newspaperDelivery.hired ? 1 : 0);
        PlayerPrefs.SetFloat ("NewspaperDeliveryPercentage", newspaperDelivery.percentage);
        PlayerPrefs.SetInt ("NewspaperDeliveryBought", newspaperDelivery.bought ? 1 : 0);
        PlayerPrefs.SetFloat ("NewspaperDeliveryTimeMultiplier", newspaperDelivery.timeMultiplier);
    } else {
        PlayerPrefs.SetInt ("NewspaperDeliveryBought", newspaperDelivery.bought ? 1 : 0);
    }

    if (carWash.transform.parent.gameObject.activeSelf) {
        PlayerPrefs.SetFloat ("CarWashMultiplier", carWash.multiplier);
        PlayerPrefs.SetFloat ("CarWashUpgradeCost", carWash.upgradeCost);
        PlayerPrefs.SetInt ("CarWashHired", carWash.hired ? 1 : 0);
        PlayerPrefs.SetFloat ("CarWashPercentage", carWash.percentage);
        PlayerPrefs.SetInt ("CarWashBought", carWash.bought ? 1 : 0);
        PlayerPrefs.SetFloat ("CarWashTimeMultiplier", carWash.timeMultiplier);
    } else {
        PlayerPrefs.SetInt ("CarWashBought", carWash.bought ? 1 : 0);
    }

    PlayerPrefs.Save ();
}

void loadData () {
    money = decimal.Parse(PlayerPrefs.GetString("SaveMoney"));

    lemonadeStand.multiplier = PlayerPrefs.GetFloat ("LemonadeStandMultiplier");
    lemonadeStand.upgradeCost = PlayerPrefs.GetFloat ("LemonadeStandUpgradeCost");
    lemonadeStand.hired = PlayerPrefs.GetInt ("LemonadeStandHired") == 1 ? true : false;
    if (lemonadeStand.hired) { lemonadeStand.enable(); lemonadeStand.percentage = PlayerPrefs.GetFloat ("LemonadeStandPercentage");}
    lemonadeStand.timeMultiplier = PlayerPrefs.GetFloat ("LemonadeStandTimeMultiplier");

    if (PlayerPrefs.GetInt ("NewspaperDeliveryBought") == 1) {
        newspaperDelivery.multiplier = PlayerPrefs.GetFloat ("NewspaperDeliveryMultiplier");
        newspaperDelivery.upgradeCost = PlayerPrefs.GetFloat ("NewspaperDeliveryUpgradeCost");
        newspaperDelivery.hired = PlayerPrefs.GetInt ("NewspaperDeliveryHired") == 1 ? true : false;
        if (newspaperDelivery.hired) {
            newspaperDelivery.enable ();
            newspaperDelivery.percentage = PlayerPrefs.GetFloat ("NewspaperDeliveryPercentage");
        }
        newspaperDelivery.transform.parent.gameObject.SetActive (true);
        newspaperDeliveryBuy.SetActive (false);
        newspaperDelivery.timeMultiplier = PlayerPrefs.GetFloat ("NewspaperDeliveryTimeMultiplier");
    }

    if (PlayerPrefs.GetInt ("CarWashBought") == 1) { 
        carWash.multiplier = PlayerPrefs.GetFloat ("CarWashMultiplier");
        carWash.upgradeCost = PlayerPrefs.GetFloat ("CarWashUpgradeCost");
        carWash.hired = PlayerPrefs.GetInt ("CarWashHired") == 1 ? true : false;
        if (carWash.hired) {
            carWash.enable ();
            carWash.percentage = PlayerPrefs.GetFloat ("CarWashPercentage");
        }
        carWash.transform.parent.gameObject.SetActive (true);
        carWashBuy.SetActive (false);
        carWash.timeMultiplier = PlayerPrefs.GetFloat ("CarWashTimeMultiplier");
    }

    hasLoaded = true;
}

void askToLoad () {
    modal.choice ("Load previous save?", loadData, dontLoad, null, "Yes", "No", null);
}

void dontLoad () {
    modal.choice ("Not loading will reset your progress, this cannot be undone!", loadData, reset, null, "Load the save", "Reset everything, I'm sure!", null);
}

void reset() {
    PlayerPrefs.DeleteAll ();
    hasLoaded = true;
}

Answer 1

Playerprefs are stored in different places depending on if you're in the editor or web player. So information saved in the editor will not be accessible from the web player and vice versa.

Answer 2

Updating Unity to 5.1.2f1 seemed to fix the issue.

Answer 3

Forget about PlayerPrefs. Serializing your game data will be more secure and more inline with OOP practices. For WebGL builds you'll need to interact with the browser by calling the JavaScript method SyncFiles(), but that can be done completely within your project. I detail the process HERE, including source code and error handling.