Program: 61486
Project: 61486
Buggy source:
public static void runDebug(SWF swf){
  String flashVars="String_Node_Str";
  String playerLocation=Configuration.playerDebugLocation.get();
  if (playerLocation.isEmpty() || (!new File(playerLocation).exists())) {
    View.showMessageDialog(null,AppStrings.translate("String_Node_Str"),AppStrings.translate("String_Node_Str"),JOptionPane.ERROR_MESSAGE);
    Main.advancedSettings("String_Node_Str");
    return;
  }
  if (swf == null) {
    return;
  }
  File tempFile=null;
  try {
    tempFile=File.createTempFile("String_Node_Str","String_Node_Str");
  }
 catch (  Exception ex) {
  }
  if (tempFile != null) {
    final File fTempFile=tempFile;
    CancellableWorker instrumentWorker=new CancellableWorker(){
      @Override protected Object doInBackground() throws Exception {
        try (OutputStream fos=new BufferedOutputStream(new FileOutputStream(fTempFile))){
          swf.saveTo(fos);
        }
         SWF instrSWF=null;
        try (FileInputStream fis=new FileInputStream(fTempFile)){
          instrSWF=new SWF(fis,false,false);
        }
 catch (        InterruptedException ex) {
          Logger.getLogger(MainFrameMenu.class.getName()).log(Level.SEVERE,null,ex);
        }
        if (instrSWF != null) {
          if (instrSWF.isAS3()) {
            instrSWF.enableDebugging(true,new File("String_Node_Str"));
          }
 else {
            instrSWF.enableDebugging(false,new File("String_Node_Str"));
            File swdFile=new File(fTempFile.getAbsolutePath().replace("String_Node_Str","String_Node_Str"));
            instrSWF.generateSwdFile(swdFile,getPackBreakPoints(true));
          }
          try (OutputStream fos=new BufferedOutputStream(new FileOutputStream(fTempFile))){
            instrSWF.saveTo(fos);
          }
         }
        return null;
      }
      @Override public void workerCancelled(){
        Main.stopWork();
      }
      @Override protected void done(){
synchronized (Main.class) {
          runTempFile=fTempFile;
          runProcessDebug=true;
        }
        Main.stopWork();
        Main.startDebugger();
        runPlayer(AppStrings.translate("String_Node_Str"),playerLocation,fTempFile.getAbsolutePath(),flashVars);
      }
    }
;
    Main.startWork(AppStrings.translate("String_Node_Str"),instrumentWorker);
    instrumentWorker.execute();
  }
}

Fixed version (ground truth):
public static void runDebug(SWF swf){
  String flashVars="String_Node_Str";
  String playerLocation=Configuration.playerDebugLocation.get();
  if (playerLocation.isEmpty() || (!new File(playerLocation).exists())) {
    View.showMessageDialog(null,AppStrings.translate("String_Node_Str"),AppStrings.translate("String_Node_Str"),JOptionPane.ERROR_MESSAGE);
    Main.advancedSettings("String_Node_Str");
    return;
  }
  if (swf == null) {
    return;
  }
  File tempFile=null;
  try {
    tempFile=File.createTempFile("String_Node_Str","String_Node_Str");
  }
 catch (  Exception ex) {
  }
  if (tempFile != null) {
    final File fTempFile=tempFile;
    CancellableWorker instrumentWorker=new CancellableWorker(){
      @Override protected Object doInBackground() throws Exception {
        try (OutputStream fos=new BufferedOutputStream(new FileOutputStream(fTempFile))){
          swf.saveTo(fos);
        }
         SWF instrSWF=null;
        try (FileInputStream fis=new FileInputStream(fTempFile)){
          instrSWF=new SWF(fis,false,false);
        }
 catch (        InterruptedException ex) {
          Logger.getLogger(MainFrameMenu.class.getName()).log(Level.SEVERE,null,ex);
        }
        if (instrSWF != null) {
          if (instrSWF.isAS3() && Configuration.autoOpenLoadedSWFs.get()) {
            DebuggerTools.injectDebugLoader(instrSWF);
          }
          instrSWF.enableDebugging(true,new File("String_Node_Str"));
          try (OutputStream fos=new BufferedOutputStream(new FileOutputStream(fTempFile))){
            instrSWF.saveTo(fos);
          }
           if (!instrSWF.isAS3()) {
            instrSWF=null;
            try (FileInputStream fis=new FileInputStream(fTempFile)){
              instrSWF=new SWF(fis,false,false);
            }
 catch (            InterruptedException ex) {
              Logger.getLogger(MainFrameMenu.class.getName()).log(Level.SEVERE,null,ex);
            }
            if (instrSWF != null) {
              File swdFile=new File(fTempFile.getAbsolutePath().replace("String_Node_Str","String_Node_Str"));
              instrSWF.generateSwdFile(swdFile,getPackBreakPoints(true));
            }
          }
        }
        return null;
      }
      @Override public void workerCancelled(){
        Main.stopWork();
      }
      @Override protected void done(){
synchronized (Main.class) {
          runTempFile=fTempFile;
          runProcessDebug=true;
        }
        Main.stopWork();
        Main.startDebugger();
        runPlayer(AppStrings.translate("String_Node_Str"),playerLocation,fTempFile.getAbsolutePath(),flashVars);
      }
    }
;
    Main.startWork(AppStrings.translate("String_Node_Str"),instrumentWorker);
    instrumentWorker.execute();
  }
}