I get segmentation fault from the following program.
If I comment out the line 
	labelAttributes.insert( attr );
in the constructor, the program works.

I have tryed with both Gtk::Fixed and Gtk::Frame. 
If the label is displayed in the constructor the problem disappears.
The problem seems not to be related to the use of polimorfism on the 
widget, as I have tryed to replace Gtk::Widget *widget with Gtk::Label 
*widget, and I get segmentation fault as well.



#include <gtkmm/main.h>
#include <gtkmm/window.h>
#include <gtkmm/fixed.h>
#include <gtkmm/frame.h>
#include <gtkmm/label.h>



class Screen : public Gtk::Window{
protected:
	Gtk::Frame screenContainer;
	Gtk::Widget *widget;
	//Gtk::Label *widget;
public:
	Screen();
	~Screen();
	void refresh();
};


Screen::Screen()
{
	set_default_size(600,600);
	Pango::Attribute attr = Pango::Attribute::create_attr_size(30000);
	Pango::AttrList labelAttributes;
	labelAttributes.insert( attr );
	Gtk::Label *label = manage( new Gtk::Label("4") );
	label->set_attributes(labelAttributes);
	widget = label;

	//screenContainer.put( *widget, 300, 300 );
  	add( screenContainer );
  	show_all();
}

Screen::~Screen(){
	if( widget != NULL ){ 
		delete widget; 
	}
}


void Screen::refresh()
{
	//screenContainer.put(*widget,200,200);
	screenContainer.add(*widget);
	show_all();
	queue_draw();

	return;
}

int main (int argc, char *argv[])
{
  Gtk::Main kit(argc, argv);
  Screen screen;
  screen.refresh();
  kit.run(screen);
  return 0;
}


This is what I get in gdb:

Program received signal SIGSEGV, Segmentation fault.
0x40590c0e in pango_attribute_copy (attr=0x8081248) at pango-
attributes.c:8686        
result = attr->klass->copy (attr);
Current language:  auto; currently c

Regards,
Enrico Costanza