Program: 81116
Project: 81116
Buggy source:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt){
  jButton1.setText("String_Node_Str");
  jButton1.setEnabled(false);
  if (jCheckBox1.isSelected()) {
    Browser.enablePaxWebsiteChecking();
  }
 else {
    if (!jCheckBox2.isSelected()) {
      return;
    }
  }
  if (jCheckBox2.isSelected()) {
    Browser.enableShowclixWebsiteChecking();
  }
  Audio.setPlayAlarm(jCheckBox3.isSelected());
  Email.setUsername(jTextField1.getText());
  Email.setPassword(new String(jPasswordField1.getPassword()));
  Browser.setExpo(jComboBox2.getSelectedItem().toString());
  Browser.setWebsiteLink(Browser.getWebsiteLink(Browser.getExpo()));
  String text=jTextField2.getText();
  if (!text.contains("String_Node_Str")) {
    text+=Email.getCarrierExtension(jComboBox1.getSelectedItem().toString());
  }
  String tempText;
  java.util.Iterator<ExtraPhonePanel> myIt=extraPhonePanelList.iterator();
  while (myIt.hasNext()) {
    ExtraPhonePanel panel=myIt.next();
    tempText=panel.getNumber();
    if (tempText.length() < 4) {
      System.out.println("String_Node_Str");
      continue;
    }
    if (!tempText.contains("String_Node_Str")) {
      tempText+=Email.getCarrierExtension(panel.getProvider());
    }
    text+="String_Node_Str" + tempText;
    System.out.println("String_Node_Str" + tempText);
  }
  System.out.println("String_Node_Str" + text);
  Email.addEmailAddress(text);
  PAXChecker.setRefreshTime(jSlider1.getValue());
  SettingsHandler.setSavePrefs(JCBSavePreferences.isSelected());
  if (JCBSavePreferences.isSelected()) {
    SettingsHandler.setSaveCellnum(JCBSaveCellnum.isSelected());
    SettingsHandler.setSavePax(JCBSaveCheckPax.isSelected());
    SettingsHandler.setSaveShowclix(JCBSaveCheckShowclix.isSelected());
    SettingsHandler.setSaveEvent(JCBSaveEvent.isSelected());
    SettingsHandler.setSaveAlarm(JCBSavePlayAlarm.isSelected());
    SettingsHandler.setSaveProvider(JCBSaveProvider.isSelected());
    SettingsHandler.setSaveRefreshTime(JCBSaveRefreshTime.isSelected());
    SettingsHandler.setSaveEmail(JCBSaveEmail.isSelected());
  }
  this.dispose();
  PAXChecker.startCheckingWebsites();
}

Fixed version (ground truth):
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt){
  jButton1.setText("String_Node_Str");
  jButton1.setEnabled(false);
  if (jCheckBox1.isSelected()) {
    Browser.enablePaxWebsiteChecking();
  }
 else {
    if (!jCheckBox2.isSelected()) {
      return;
    }
  }
  if (jCheckBox2.isSelected()) {
    Browser.enableShowclixWebsiteChecking();
  }
  Audio.setPlayAlarm(jCheckBox3.isSelected());
  Email.setUsername(jTextField1.getText());
  Email.setPassword(new String(jPasswordField1.getPassword()));
  Browser.setExpo(jComboBox2.getSelectedItem().toString());
  Browser.setWebsiteLink(Browser.getWebsiteLink(Browser.getExpo()));
  String text=jTextField2.getText();
  if (!text.contains("String_Node_Str")) {
    text+=Email.getCarrierExtension(jComboBox1.getSelectedItem().toString());
  }
  String tempText;
  java.util.Iterator<ExtraPhonePanel> myIt=extraPhonePanelList.iterator();
  while (myIt.hasNext()) {
    ExtraPhonePanel panel=myIt.next();
    tempText=panel.getNumber();
    if (tempText.length() < 4) {
      System.out.println("String_Node_Str");
      continue;
    }
    String[] split=tempText.split("String_Node_Str");
    tempText="String_Node_Str";
    for (    String split1 : split) {
      split1=split1.trim();
      tempText+=split1;
      if (!split1.contains("String_Node_Str")) {
        tempText+=Email.getCarrierExtension(panel.getProvider());
      }
      tempText+="String_Node_Str";
    }
    text+="String_Node_Str" + tempText;
    System.out.println("String_Node_Str" + tempText);
  }
  System.out.println("String_Node_Str" + text);
  Email.addEmailAddress(text);
  PAXChecker.setRefreshTime(jSlider1.getValue());
  SettingsHandler.setSavePrefs(JCBSavePreferences.isSelected());
  if (JCBSavePreferences.isSelected()) {
    SettingsHandler.setSaveCellnum(JCBSaveCellnum.isSelected());
    SettingsHandler.setSavePax(JCBSaveCheckPax.isSelected());
    SettingsHandler.setSaveShowclix(JCBSaveCheckShowclix.isSelected());
    SettingsHandler.setSaveEvent(JCBSaveEvent.isSelected());
    SettingsHandler.setSaveAlarm(JCBSavePlayAlarm.isSelected());
    SettingsHandler.setSaveProvider(JCBSaveProvider.isSelected());
    SettingsHandler.setSaveRefreshTime(JCBSaveRefreshTime.isSelected());
    SettingsHandler.setSaveEmail(JCBSaveEmail.isSelected());
  }
  this.dispose();
  PAXChecker.startCheckingWebsites();
}