QMessageBox does not respond to click on Mac

After the commits to qt5 on 10/14/2012 (http://qt.gitorious.org/qt/qt5/commit/da8730bf218cde1186e8f8e3307c82b26fed1609 and http://qt.gitorious.org/qt/qt5/commit/21f9eaf60e83dd3b8376129c1d96bcdad943c4c9), QMessageBox stop responding to clicking at the OK button. Run the following code on Mac. The OK button does not respond to click and the window stay on top of all windows. It's also taking 100% of a core spinning.

#include <QApplication>
#include <QMessageBox>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	QMessageBox::warning(NULL, "", "warning!");
	return a.exec();
}