Totally confusing segmentation violation

[mstoth]

@ambershark Here's the three files associated with the panel I tried to present. Really nothing to see here however, it is just the template from choosing Qt Designer Form Class and adding one label. Without the label, everything is fine. Once the label is there, it crashes. To instantiate it all I do is

    DialogVoicePresets *dvp = new DialogVoicePresets(this);
    dvp->show();

The c file:

#include "dialogvoicepresets.h"
#include "ui_dialogvoicepresets.h"

DialogVoicePresets::DialogVoicePresets(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::DialogVoicePresets)
{
    ui->setupUi(this);
}

DialogVoicePresets::~DialogVoicePresets()
{
    delete ui;
}

The Header

#ifndef DIALOGVOICEPRESETS_H
#define DIALOGVOICEPRESETS_H

#include <QDialog>

namespace Ui {
class DialogVoicePresets;
}

class DialogVoicePresets : public QDialog
{
    Q_OBJECT

signals:
    void openPresets();

public:
    explicit DialogVoicePresets(QWidget *parent = 0);
    ~DialogVoicePresets();

private:
    Ui::DialogVoicePresets *ui;
};

#endif // DIALOGVOICEPRESETS_H

And the .ui file

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>DialogVoicePresets</class>
 <widget class="QDialog" name="DialogVoicePresets">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>480</width>
    <height>272</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Dialog</string>
  </property>
  <widget class="QLabel" name="label">
   <property name="geometry">
    <rect>
     <x>200</x>
     <y>20</y>
     <width>59</width>
     <height>16</height>
    </rect>
   </property>
   <property name="text">
    <string>TextLabel</string>
   </property>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>

[mstoth]

@kshegunov
I tried to setQT_NO_FT_CACHE to 1. I'm running 4.0.3 but I got to this form from the Debug button on the side panel. On my version of Creator the run button just runs the program. Once I picked Debug then I had the options of Build and Run where I could choose the environment variables as shown in this image.

Unfortunately the problem still exists after this. However thank you for the idea! Still looking... I will see about upgrading to a later version.

[ambershark]

@mstoth Couple ideas..

1. What happens if you do dvp->exec() to make it modal instead of show()?

2. Do you have a custom event loop somewhere?

3. What happens if you do not give your dialog a parent? I.e. new DialogVoicePresets();?

4. If possible can you test this on another linux box? Preferably something more modern than redhat? Not necessarily cutting edge like arch/gentoo, but even something simple and newer like ubuntu. That will help show if it's a problem with your system or if it's a problem with your code.

[mstoth]

@ambershark
First many thanks to all who provided time and help!

Finally after several months in desperation, I just re-wrote the MainWindow code, copied all the panels and created a new version of the application. Now I do not have the crashing problem. I do not see how it's different so there must be some nearly invisible artifact that was throwing a monkey wrench into the works. That's my guess anyway.

Again, many thanks to all! As a friend of mine used to say "Your blood's worth bottlin'"