QMessageBox::information always crashes

[Tito]

for no apparent reason, I can't get QMessageBox::information to work in my current application. It always crashes even in the simplest cases.

for example, even this causes a crash.

myAbout 	= new QAction(tr("About"), this);
	connect(myAbout, SIGNAL(triggered()), SLOT(aboutClicked()));
	#if defined(Q_OS_SYMBIAN) && defined(USE_ACTIONS)
		menuBar()->addAction(myAbout);
	#endif
 
 
void myApplication::aboutClicked()
	{
	qDebug() << "myApplication::aboutClicked()";
	QMessageBox::information ( this, APP_NAME, "Some text" );
	//QMessageBox::information ( 0, APP_NAME, "Some text" );
	}

myAbout 	= new QAction(tr("About"), this);
	connect(myAbout, SIGNAL(triggered()), SLOT(aboutClicked()));
	#if defined(Q_OS_SYMBIAN) && defined(USE_ACTIONS)
		menuBar()->addAction(myAbout);
	#endif


void myApplication::aboutClicked()
	{
	qDebug() << "myApplication::aboutClicked()";
	QMessageBox::information ( this, APP_NAME, "Some text" );
	//QMessageBox::information ( 0, APP_NAME, "Some text" );
	}

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I do have a couple of threads running, but the QMessageBox is always called from the main UI thread. Any ideas?