Debug and Log print no longer working

import QtQuick 2.6
import QtQuick.Window 2.2

Window {
    visible: true

    Text {
        text: qsTr("Hello World")
        anchors.centerIn: parent

        Component.onCompleted: {
            console.warn("warn completed")
            console.log("log completed")
            console.error("error completed")
            console.debug("debug completed")
            console.exception("exception completed")
            console.info("info completed")
        }
    }
}

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

(source: http://stackoverflow.com/questions/36338000/qml-console-log-and-console-debug-dont-write-to-console)

This used to work in Qt 5.5 (I'm currently on 5.4 due to dbus being broken in 5.5). As reported originally from the user in stackoverflow, debug and log are broken, but the other outputs still work.

Same affect with qDebug() in C++ being broken. It simply outputs nothing.

I've also noticed if I put a qDebug() before the initialization of QGuiApplication (or QCoreApplication), it will work. It will NOT work if I attempt to qDebug() immediately after it.

note I just noticed one other thing. So if I use the prebuilt Qt from the Qt maintenancetool installer, logging DOES work. Therefore this may be less an issue with Qt specifically, and more an issue with how EPEL Release repository packages and compiles Qt?

qt5-qtbase.x86_64 5.6.0-7.el7 @epel