Crash application during call JavaScript function from Flash Player

[ZicoRio]

Hi all.
Crash application during call JavaScript function (with 2-3th times) from Flash Player
Run debugger: SIGSEGV (Segmentation fault)
last stack - Cannot access memory at address 0x0
else stack - Cannot access memory at address 0xbaadf00d

In Firefox, Chrome - all good works!

OS: Windows XP x32 Pro SP3.
Qt: 4.8.4
MinGW: 4.4
IDE: 7.2.1.
FlashPlayer: 11.5.502.110 (debug version)

main.cpp
@
#include <QApplication>
#include <QLocale>
#include <QTextCodec>
#include <QWebSettings>

#include "TestBrowser.h"

int main(int argc,char *argv[]){
QApplication a(argc,argv);
QWebSettings *ws=QWebSettings::globalSettings();
ws->setAttribute(QWebSettings::PluginsEnabled,true);
ws->setAttribute(QWebSettings::JavascriptEnabled,true);
ws->setAttribute(QWebSettings::JavaEnabled,true);
ws->setAttribute(QWebSettings::JavascriptCanOpenWindows,true);
ws->setAttribute(QWebSettings::JavascriptCanCloseWindows,true);
ws->setAttribute(QWebSettings::JavascriptCanAccessClipboard,true);
ws->setAttribute(QWebSettings::SpatialNavigationEnabled,true);
ws->setAttribute(QWebSettings::OfflineStorageDatabaseEnabled,true);
ws->setAttribute(QWebSettings::OfflineWebApplicationCacheEnabled,true);
ws->setAttribute(QWebSettings::LocalStorageEnabled,true);
ws->setAttribute(QWebSettings::PrintElementBackgrounds,false);
ws->setAttribute(QWebSettings::DeveloperExtrasEnabled,true);
QLocale::setDefault(QLocale(QLocale::Russian,QLocale::RussianFederation));
QTextCodec *utfcodec=QTextCodec::codecForName("UTF-8");
QTextCodec::setCodecForTr(utfcodec);
QTextCodec::setCodecForCStrings(utfcodec);

TestBrowser *mw = new TestBrowser();
mw->setWindowIcon(QIcon("favicon.ico"));
mw->resize(1060,800);
mw->move(40,0);
mw->show();

return a.exec();

}
@

TestBrowser.h
@
#ifndef TESTBROWSER_H
#define TESTBROWSER_H

#include <QApplication>
#include <QMainWindow>
#include <QObject>
#include <QLineEdit>
#include <QToolBar>
#include <QPushButton>
#include <QMessageBox>
#include <QPrintPreviewDialog>
#include <QPrinter>
#include <QWebView>
#include <QWebFrame>
#include <QUrl>

class TestBrowser : public QMainWindow{
Q_OBJECT
public:
TestBrowser();
QString tp;
QWebView *view;
QLineEdit *locationEdit;
void doAlertPan(QString me);

public slots:
void changeLocation();
void toTestPage();
void doPrint(QWebFrame * fr);

};

#endif
@

TestBrowser.cpp
@
#include "TestBrowser.h"

TestBrowser::TestBrowser(){
tp="http://ifinterface.com/techtest/testprint.html";
view=new QWebView(this);
view->page()->setForwardUnsupportedContent(true);
view->page()->createStandardContextMenu();

locationEdit=new QLineEdit(this);
locationEdit->setSizePolicy(QSizePolicy::Expanding,locationEdit->sizePolicy().verticalPolicy());

QToolBar *toolBar=addToolBar("Navigation");
toolBar->addAction(view->pageAction(QWebPage::Back));
toolBar->addAction(view->pageAction(QWebPage::Forward));
toolBar->addAction(view->pageAction(QWebPage::Reload));
toolBar->addAction(view->pageAction(QWebPage::Stop));
QPushButton *b1=new QPushButton("to TestPage",this);
toolBar->addWidget(b1);
toolBar->addWidget(locationEdit);
QPushButton *b2=new QPushButton("=>",this);
toolBar->addWidget(b2);

connect(view->page(),SIGNAL(printRequested(QWebFrame *)),this,SLOT(doPrint(QWebFrame *)));
connect(b1,SIGNAL(clicked()),this,SLOT(toTestPage()));
connect(b2,SIGNAL(clicked()),SLOT(changeLocation()));
connect(locationEdit,SIGNAL(returnPressed()),SLOT(changeLocation()));

locationEdit->setText(tp);
view->load(QUrl(tp));

setCentralWidget(view);

}

void TestBrowser::doAlertPan(QString me){
QMessageBox msgBox;
msgBox.setWindowIcon(QIcon("favicon.ico"));
msgBox.setIcon(QMessageBox::Information);
msgBox.setWindowTitle(tr("WebPage :: Сообщение"));
msgBox.setText(me);
msgBox.exec();
}

void TestBrowser::toTestPage(){
locationEdit->setText(tp);
view->load(QUrl(tp));
view->setFocus();
}

void TestBrowser::doPrint(QWebFrame * fr){
QPrintPreviewDialog* dialog=new QPrintPreviewDialog(this);
dialog->resize(800, 750);
connect(dialog,SIGNAL(paintRequested(QPrinter*)),fr,SLOT(print(QPrinter*)));
dialog->exec();
dialog->deleteLater();
}

void TestBrowser::changeLocation(){
QUrl url=QUrl(locationEdit->text());
view->load(url);
view->setFocus();
}
@

Most asked to point a finger that is not so.
If you have any thoughts / ideas - I will be glad to know.

[ZicoRio]

All problems are in QtWebKit (Qt 4.8) during compile with MinGW 4.4
Same problems are in QtWebKit (Qt 5.0) during compile with VS2010 too.

If to compile QtWebKit (Qt 4.8) with VS2010 - all good!

All good luck.