Heap corruption while using QVariant or QList<QVariant> retreiving QSettings values in MSVC 2010

    msvcr100d.dll!operator delete(void * pUserData) Line 52 + 0x51 bytes C++
    > testini.exe!QVariant::`scalar deleting destructor'() + 0x46 bytes C++
    testini.exe!QList<QVariant>::node_destruct(QList<QVariant>::Node * from, QList<QVariant>::Node * to) Line 418 + 0x3e bytes C++
    testini.exe!QList<QVariant>::free(QListData::Data * data) Line 744 C++
    testini.exe!QList<QVariant>::~QList<QVariant>() Line 718 C++
    testini.exe!WzConfig::vector2i(const QString & name) Line 65 + 0x1d bytes C++
    testini.exe!main(int argc, char * * argv) Line 82 + 0x31 bytes C++

    Vector2i WzConfig::vector2i(const QString &name)
    {
    Vector2i r;
    ASSERT_OR_RETURN(r, contains(name), "Missing %s", name.toUtf8().constData());
    QVariantList v = value(name).toList();
    ASSERT(v.size() == 2, "Bad list of %s", name.toUtf8().constData());
    r.x = v[0].toInt();
    r.y = v[1].toInt();
    return r;
    }

Vector2i WzConfig::vector2i(const QString &name)
{
	Vector2i r;
	ASSERT_OR_RETURN(r, contains(name), "Missing %s", name.toUtf8().constData());
	QStringList v = value(name).toStringList();
	ASSERT(v.size() == 2, "Bad list of %s", name.toUtf8().constData());
	r.x = v[0].toInt();
	r.y = v[1].toInt();
	return r;
}

class WzConfig : public QSettings
{
	Q_OBJECT

public:
	WzConfig(const QString &name, QObject *parent = 0) : QSettings(QString("test.ini"), QSettings::IniFormat, parent) { Q_UNUSED(name); }
	Vector3f vector3f(const QString &name);
	void setVector3f(const QString &name, const Vector3f &v);
	Vector3i vector3i(const QString &name);
	void setVector3i(const QString &name, const Vector3i &v);
	Vector2i vector2i(const QString &name);
	void setVector2i(const QString &name, const Vector2i &v);
};

struct Vector2i
{
	Vector2i() {}
	Vector2i(int x, int y) : x(x), y(y) {}

	int x, y;
};


    int main(int argc, char *argv[])
    {
    QCoreApplication a(argc, argv);
     
    {
    WzConfig ini("test.ini");
    ini.setVector2i("test", Vector2i(1, 2));
    ini.setVector3i("test2", Vector3i(1, 2, 3));
    ini.setVector3f("test3", Vector3f(1, 2, 3));
    ini.setVector3f("test3", Vector3i(1, 2, 3));
    ini.setVector3i("test3", Rotation(1, 2, 3));
    }
    {
    WzConfig ini("test.ini");
    Vector2i v = ini.vector2i("test");
    qWarning("x = %d, y = %d", v.x, v.y);
    }
     
    return 0;
    }