Menu's do not show under OSX when qt is run without calling exec until a popup menu is invoked

So my application has its own event loop and I just integrate Qt into my event loop. This has been working fine for a while but just broke in 4.6. None of my menus show until I get a popup menu to show first. If I create a dummy event loop and have a single shot timer quit it the menus show fine. I see the same behavior with Cocoa and Carbon builds. I modified the examples/mainwindows/menus example to illustrate my point. The only file I modified was main.cpp.

 

#include <QApplication>
#include <QAbstractEventDispatcher>
#include <QTimer>

#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow window;
    window.show();

// If you uncomment the next three lines everything works as expected
//     QEventLoop dummyLoop;
//     QTimer::singleShot(0, &dummyLoop, SLOT (quit ()));
//     dummyLoop.exec ();

    QAbstractEventDispatcher *ed = QAbstractEventDispatcher::instance ();

    do {

        QCoreApplication::sendPostedEvents (0, 0);
        QCoreApplication::processEvents ();

    } while (window.isVisible ());

//    return app.exec();

    return 0;
}

There seems to be some sort of event that is not getting sent unless a QEventLoop::exec is called. If this is not a bug can you please let me know what I can do to get my code to work without having to ever call exec? Thanks.