QMenu's QAction works with QShortcut, not with button

I'm facing an odd problem with a code of mine. I have a menu item "Open File" which has a shortcut Ctrl+C. If I run the program and hit Ctrl+C, the program works like a charm, no problems. However, if I instead go to the menu item and click it, the function itself also works like a charm, but at the end of it, the program crashes. Here's the code:

Code:

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Canvas::Canvas(const QPoint& Position, const QSize& Size,QWidget* Parent) :
			   QSFMLCanvas(Parent, Position, Size),
			   MenuBar(this)
{
	setMouseTracking(true);
	setAttribute(Qt::WA_DeleteOnClose);
	points.reserve(3000);
 
	EqualizeSize=0;
	PointsVisible=true;
 
	QMenu* menu = MenuBar.addMenu("File");
		menu->addAction("&Open",this,SLOT(OpenFile()),QKeySequence::Open);
		menu->addAction("&Save",this,SLOT(SaveFile()),QKeySequence::Save);
		menu->addAction("&Quit",QCoreApplication::instance(),SLOT(quit()),QKeySequence::Quit);
//...

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The shortcut is never redefined anywhere else in the code (the code above is, in fact, the only time the function OpenFile() is called).

Am I doing anything wrong here? Why does using "Ctrl+C" work, but using the menu-button crash, at the end of the OpenFile() function? Does the fact that I set the menu ("File") as a temporary variable have anything to do with this?

Any help please?

You should post the rest of the code.

By the way, how is it that QKeySequence::Open maps to Ctrl+C for you, and not Ctrl+O per the docs?

Oh, wow. I meant Ctrl+O, of course. Don't know what happened there.

Here's the rest of the constructor. I can't post the remainder of the code because, well, its a few thousand lines long. The class Canvas inherits from QWidget and sf::RenderWindow, from the SFML Graphics library.

Code:

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Canvas::Canvas(const QPoint& Position, const QSize& Size,QWidget* Parent) :
			   QSFMLCanvas(Parent, Position, Size),
			   MenuBar(this)
{
	setMouseTracking(true);
	setAttribute(Qt::WA_DeleteOnClose);
	points.reserve(3000);
 
	EqualizeSize=0;
	PointsVisible=true;
 
	QMenu* menu = MenuBar.addMenu("File");
		menu->addAction("&Open",this,SLOT(OpenFile()),QKeySequence::Open);
		menu->addAction("&Save",this,SLOT(SaveFile()),QKeySequence::Save);
		menu->addAction("&Quit",QCoreApplication::instance(),SLOT(quit()),QKeySequence::Quit);
	menu = MenuBar.addMenu("Edit");
		menu->setEnabled(false);
		connect(this,SIGNAL(FileLoaded(bool)),menu,SLOT(setEnabled(bool)));
		QAction* action = menu->addAction("&Fault Properties",this,SLOT(FaultPropertiesDlg()),QString("Ctrl+F"));
			action->setEnabled(false);
			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
		action = menu->addAction("&Equalize Fault Segments",this,SLOT(EqualizeDlg()),QString("Ctrl+E"));
			action->setEnabled(false);
			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
		menu->addSeparator();
		action = menu->addAction("&Define Seafloor",this,SLOT(SeafloorDlg()),QString("Ctrl+D"));
			action->setEnabled(false);
			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
		action = menu->addAction("&New Horizon",this,SLOT(NewHorizonDlg()),QString("Ctrl+N"));
			action->setEnabled(false);
			connect(this,SIGNAL(SeaFloorDefined(bool)),action,SLOT(setEnabled(bool)));
		action = menu->addAction("&Horizon Properties",this,SLOT(HorizonPropertiesDlg()),QString("Ctrl+H"));
			action->setEnabled(false);
			connect(this,SIGNAL(SeaFloorDefined(bool)),action,SLOT(setEnabled(bool)));
	menu = MenuBar.addMenu("View");
		menu->setEnabled(false);
		connect(this,SIGNAL(FileLoaded(bool)),menu,SLOT(setEnabled(bool)));
		action = menu->addAction("&Global View",this,SLOT(ChangeView_Key()),QString("Ctrl+G"));
			action->setEnabled(false);
			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
		action = menu->addAction("&Show Sealevel",this,SLOT(ViewSealevel()));
			action->setEnabled(false);
			action->setCheckable(true);
			action->setChecked(true);
			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
			connect(this,SIGNAL(ViewingSealevel(bool)),action,SLOT(setChecked(bool)));
		action = menu->addAction("Show &Points",this,SLOT(ViewPoints()));
			action->setEnabled(false);
			action->setCheckable(true);
			action->setChecked(true);
			connect(this,SIGNAL(FileLoaded(bool)),action,SLOT(setEnabled(bool)));
			connect(this,SIGNAL(ViewingPoints(bool)),action,SLOT(setChecked(bool)));
	menu = MenuBar.addMenu("Analyze");
		menu->setEnabled(false);
		connect(this,SIGNAL(SeaFloorDefined(bool)),menu,SLOT(setEnabled(bool)));
		action = menu->addAction("Estimate Maximum PPI",this,SLOT(PPIDlg()),QString("Ctrl+A"));
			action->setEnabled(false);
			connect(this,SIGNAL(SeaFloorDefined(bool)),action,SLOT(setEnabled(bool)));
		action = menu->addAction("View Geostatic Ratio",this,SLOT(ViewRatio()),QString("Ctrl+R"));
			action->setEnabled(false);
			action->setCheckable(true);
			connect(this,SIGNAL(RatioCalculated(bool)),action,SLOT(setEnabled(bool)));
			connect(this,SIGNAL(ViewingRatio(bool)),action,SLOT(setChecked(bool)));
}

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