Program: 21038
Project: 21038
Buggy source:
public void actionPerformed(final ActionEvent e){
  if (e.getSource() == btPreview) {
    dialogImage.setDistance((Integer)thresholdSpinner.getValue());
    dialogImage.setColorDistanceMode(modeByte);
    dialogImage.setColor(colorChooser.getColor().getRGB());
    bgim.add(dialogImage);
    bgim.clearCaptchaAll();
    bgim.remove(dialogImage);
    final Image image2=bgim.getScaledCaptchaImage();
    new GuiRunnable<Object>(){
      public Object runSave(){
        bgv.image=image2;
        bgv.repaint();
        return null;
      }
    }
.waitForEDT();
  }
 else   if (e.getSource() == btColorChoose) {
    new GuiRunnable<Object>(){
      public Object runSave(){
        JDialog dialog=JColorChooser.createDialog(colorChooser,JDL.L("String_Node_Str","String_Node_Str"),true,colorChooser,null,null);
        dialog.setVisible(true);
        dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        return null;
      }
    }
.waitForEDT();
  }
 else   if (e.getSource() == btFinished) {
    bgim.add(dialogImage);
    new GuiRunnable<Object>(){
      public Object runSave(){
        dialog.dispose();
        return null;
      }
    }
.waitForEDT();
    ret=dialogImage;
  }
 else   if (e.getSource() == btLoadBackgroundImage) {
    File fch=JDFileChooser.getFile(JDFileChooser.ImagesOnly);
    File fout=new File(bgim.methode.file,"String_Node_Str" + JDHash.getMD5(fch) + "String_Node_Str"+ JDIO.getFileExtension(fch));
    JDIO.copyFile(fch,fout);
    dialogImage=new BackGroundImage();
    dialogImage.setBackgroundImage(fout.getName());
    dialogImage.setColor(colorChooser.getColor().getRGB());
    dialogImage.setDistance((Integer)thresholdSpinner.getValue());
    dialogImage.setColorDistanceMode(modeByte);
    bgim.add(dialogImage);
    bgim.clearCaptchaAll();
    bgim.remove(dialogImage);
    btPreview.setEnabled(true);
    final Image image2=bgim.getScaledCaptchaImage();
    new GuiRunnable<Object>(){
      public Object runSave(){
        bgv.image=image2;
        bgv.repaint();
        return null;
      }
    }
.waitForEDT();
  }
 else   if (e.getSource() == btCreateBackgroundFilter) {
    File fout=BackgroundFilterCreater.create(bgim.methode);
    dialogImage=new BackGroundImage();
    dialogImage.setBackgroundImage(fout.getName());
    dialogImage.setColor(colorChooser.getColor().getRGB());
    dialogImage.setDistance((Integer)thresholdSpinner.getValue());
    dialogImage.setColorDistanceMode(modeByte);
    bgim.add(dialogImage);
    bgim.clearCaptchaAll();
    bgim.remove(dialogImage);
    btPreview.setEnabled(true);
    final Image image2=bgim.getScaledCaptchaImage();
    new GuiRunnable<Object>(){
      public Object runSave(){
        bgv.image=image2;
        bgv.repaint();
        return null;
      }
    }
.waitForEDT();
  }
 else   if (e.getSource() == mode) {
    modeByte=((ColorMode)mode.getSelectedItem()).mode;
  }
}

Fixed version (ground truth):
public void actionPerformed(final ActionEvent e){
  if (e.getSource() == btPreview) {
    dialogImage.setDistance((Integer)thresholdSpinner.getValue());
    dialogImage.setColorDistanceMode(colorMode);
    dialogImage.setColor(colorChooser.getColor().getRGB());
    bgim.add(dialogImage);
    bgim.clearCaptchaAll();
    bgim.remove(dialogImage);
    final Image image2=bgim.getScaledCaptchaImage();
    new GuiRunnable<Object>(){
      public Object runSave(){
        bgv.image=image2;
        bgv.repaint();
        return null;
      }
    }
.waitForEDT();
  }
 else   if (e.getSource() == btColorChoose) {
    new GuiRunnable<Object>(){
      public Object runSave(){
        JDialog dialog=JColorChooser.createDialog(colorChooser,JDL.L("String_Node_Str","String_Node_Str"),true,colorChooser,null,null);
        dialog.setVisible(true);
        dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        return null;
      }
    }
.waitForEDT();
  }
 else   if (e.getSource() == btFinished) {
    if (dialogImage != null)     bgim.add(dialogImage);
    new GuiRunnable<Object>(){
      public Object runSave(){
        dialog.dispose();
        return null;
      }
    }
.waitForEDT();
    ret=dialogImage;
  }
 else   if (e.getSource() == btLoadBackgroundImage) {
    File fch=JDFileChooser.getFile(JDFileChooser.ImagesOnly);
    if (fch != null) {
      File fout=new File(bgim.methode.file,"String_Node_Str" + JDHash.getMD5(fch) + "String_Node_Str"+ JDIO.getFileExtension(fch));
      JDIO.copyFile(fch,fout);
      dialogImage=new BackGroundImage();
      dialogImage.setBackgroundImage(fout.getName());
      dialogImage.setColor(colorChooser.getColor().getRGB());
      dialogImage.setDistance((Integer)thresholdSpinner.getValue());
      dialogImage.setColorDistanceMode(colorMode);
      bgim.add(dialogImage);
      bgim.clearCaptchaAll();
      bgim.remove(dialogImage);
      btPreview.setEnabled(true);
      final Image image2=bgim.getScaledCaptchaImage();
      new GuiRunnable<Object>(){
        public Object runSave(){
          bgv.image=image2;
          bgv.repaint();
          return null;
        }
      }
.waitForEDT();
    }
  }
 else   if (e.getSource() == btCreateBackgroundFilter) {
    File fout=BackgroundFilterCreater.create(bgim.methode);
    if (fout != null && fout.exists()) {
      dialogImage=new BackGroundImage();
      dialogImage.setBackgroundImage(fout.getName());
      dialogImage.setColor(colorChooser.getColor().getRGB());
      dialogImage.setDistance((Integer)thresholdSpinner.getValue());
      dialogImage.setColorDistanceMode(colorMode);
      bgim.add(dialogImage);
      bgim.clearCaptchaAll();
      bgim.remove(dialogImage);
      btPreview.setEnabled(true);
      final Image image2=bgim.getScaledCaptchaImage();
      new GuiRunnable<Object>(){
        public Object runSave(){
          bgv.image=image2;
          bgv.repaint();
          return null;
        }
      }
.waitForEDT();
    }
  }
 else   if (e.getSource() == colorModeBox) {
    colorMode=((ColorMode)colorModeBox.getSelectedItem()).mode;
  }
}