Hello everybody. I'm writing a rather simple program on Qt. While I was working on 32-bit Ubuntu everything worked fine but when I tried to run the code under 64-bit Ubuntu it crashes with SIGABRT. Here's the simplified code that shares the same problems. it's your basic QTableWidget-based file manager

mainwindow.h
Qt Code: 
  1. #ifndef MAINWINDOW_H
  2. #define MAINWINDOW_H
  3.  
  4. #include <stdhdr.h>
  5. class BrowserTable;
  6.  
  7. namespace Ui {
  8.     class MainWindow;
  9. }
  10.  
  11. class MainWindow : public QMainWindow
  12. {
  13.     Q_OBJECT
  14.  
  15. public:
  16.     explicit MainWindow(QWidget *parent = 0);
  17.     ~MainWindow();
  18.  
  19. private:
  20.     Ui::MainWindow *ui;
  21.     BrowserTable *m_pBrowserTable;
  22. };
  23.  
  24. #endif // MAINWINDOW_H
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mainwindow.cpp

Qt Code: 
  1. #include <stdhdr.h>
  2.  
  3. MainWindow::MainWindow(QWidget *parent) :
  4.     QMainWindow(parent),
  5.     ui(new Ui::MainWindow)
  6. {
  7.     ui->setupUi(this);
  8.  
  9.     m_pBrowserTable = new BrowserTable(this, ui, "/");
  10.  
  11.  
  12. }
  13.  
  14. MainWindow::~MainWindow()
  15. {
  16.     delete m_pBrowserTable;
  17.     if(ui)
  18.         delete ui;
  19. }
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browsertable.h
Qt Code: 
  1. #ifndef BROWSERTABLE_H
  2. #define BROWSERTABLE_H
  3.  
  4. #include "stdhdr.h"
  5.  
  6. class MainWindow;
  7. class BrowserTable : public QObject
  8. {
  9.     Q_OBJECT
  10. public:
  11.     explicit BrowserTable(MainWindow *pMainWindow, Ui::MainWindow *pui, QString top_level, QObject *parent = 0);
  12.     void SetupTable();
  13.     ~BrowserTable();
  14.  
  15. public slots:
  16.     void FillTableAsTable(QString);
  17.  
  18. private:
  19.     Ui::MainWindow *ui;
  20.     MainWindow *m_pMainWindow;
  21.  
  22. };
  23.  
  24. #endif // BROWSERTABLE_H
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browsertable.cpp
Qt Code: 
  1. #include "browsertable.h"
  2.  
  3. BrowserTable::BrowserTable(MainWindow *pMainWindow, Ui::MainWindow *pui, QString top_level, QObject *parent) :
  4.     QObject(parent)
  5. {
  6.     ui =pui;
  7.     m_pMainWindow=pMainWindow;
  8.  
  9.     SetupTable();
  10. }
  11.  
  12. BrowserTable::~BrowserTable()
  13. {
  14.  
  15. }
  16.  
  17. void BrowserTable::SetupTable()
  18. {
  19.     ui->table_browser->setColumnCount(4);*
  20.     QHeaderView *headerView = ui->table_browser->horizontalHeader();
  21.     headerView->setResizeMode(1, QHeaderView::Stretch);
  22.     headerView->setResizeMode(0, QHeaderView::Fixed);
  23.     headerView->setResizeMode(2, QHeaderView::Fixed);
  24.     headerView->setClickable(false);
  25.  
  26.     QTableWidgetItem *h_item1 = new QTableWidgetItem(" ");
  27.  
  28.     QTableWidgetItem *h_item2 = new QTableWidgetItem("Name");
  29.     QTableWidgetItem *h_item3 = new QTableWidgetItem("Type");
  30.     QTableWidgetItem *h_item4 = new QTableWidgetItem("Size");
  31.     ui->table_browser->setHorizontalHeaderItem(0, h_item1);
  32.     ui->table_browser->setHorizontalHeaderItem(1, h_item2);
  33.     ui->table_browser->setHorizontalHeaderItem(2, h_item3);
  34.     ui->table_browser->setHorizontalHeaderItem(3, h_item4);
  35.     ui->table_browser->horizontalHeader()->setVisible(true);
  36.     ui->table_browser->verticalHeader()->setVisible(false);
  37.     ui->table_browser->setColumnWidth(0, 20);
  38.     ui->table_browser->setShowGrid(false);
  39.  
  40.     ui->table_browser->setSelectionMode(QAbstractItemView::SingleSelection);
  41.     ui->table_browser->setSelectionBehavior(QAbstractItemView::SelectRows);
  42.  
  43.     FillTableAsTable("/");
  44. }
  45.  
  46. void BrowserTable::FillTableAsTable(QString path)
  47. {
  48.     ui->table_browser->setHidden(false);
  49.     QDir current_dir(path);
  50.  
  51.     QFileInfoList file_list = current_dir.entryInfoList();
  52.     if (file_list.count()==0)
  53.     {
  54.         return;
  55.     }
  56.  
  57.     ui->table_browser->clear();
  58.     ui->table_browser->setRowCount(file_list.count());
  59.  
  60.     for (int i=0; i<file_list.count(); i++)
  61.     {
  63.         QIcon myicon = prov->icon(file_list.at(i));
  64.  
  69.  
  70.         item1->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEnabled|Qt::ItemIsUserCheckable);
  71.         item1->setIcon(myicon);
  72.         item3->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEnabled);
  73.  
  74.         ui->table_browser->setItem(i, 1, item1);
  75.         ui->table_browser->setItem(i, 0, item2);
  76.         ui->table_browser->setItem(i, 2, item3);
  77.         ui->table_browser->setItem(i, 3, item4);
  78.  
  79.     }
  80. }
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The problem seems to be with the ui pointer in the Browsertable but I have no idea how to fix the issue while keeping the same class structure. Any hel would be appreciated.