Program: 629
Project: 629
Buggy source:
@Override public void applyParameters(Material program){
  super.applyParameters(program);
  DynamicFBOsManager dynamicFBOsManager=CoreRegistry.get(DynamicFBOsManager.class);
  FBO scene=dynamicFBOsManager.get(DefaultDynamicFBOs.ReadOnlyGBuffer.getName());
  int texId=0;
  if (scene != null) {
    GL13.glActiveTexture(GL13.GL_TEXTURE0 + texId);
    scene.bindTexture();
    program.setInt("String_Node_Str",texId++,true);
    GL13.glActiveTexture(GL13.GL_TEXTURE0 + texId);
    scene.bindDepthTexture();
    program.setInt("String_Node_Str",texId++,true);
  }
  program.setFloat("String_Node_Str",density,true);
  program.setFloat("String_Node_Str",exposure,true);
  program.setFloat("String_Node_Str",weight,true);
  program.setFloat("String_Node_Str",decay,true);
  WorldRenderer worldRenderer=CoreRegistry.get(WorldRenderer.class);
  BackdropProvider backdropProvider=CoreRegistry.get(BackdropProvider.class);
  if (worldRenderer != null) {
    Vector3f sunDirection=backdropProvider.getSunDirection(true);
    Camera activeCamera=worldRenderer.getActiveCamera();
    Vector4f sunPositionWorldSpace4=new Vector4f(sunDirection.x * 10000.0f,sunDirection.y * 10000.0f,sunDirection.z * 10000.0f,1.0f);
    Vector4f sunPositionScreenSpace=new Vector4f(sunPositionWorldSpace4);
    activeCamera.getViewProjectionMatrix().transform(sunPositionScreenSpace);
    sunPositionScreenSpace.x/=sunPositionScreenSpace.w;
    sunPositionScreenSpace.y/=sunPositionScreenSpace.w;
    sunPositionScreenSpace.z/=sunPositionScreenSpace.w;
    sunPositionScreenSpace.w=1.0f;
    program.setFloat("String_Node_Str",activeCamera.getViewingDirection().dot(sunDirection),true);
    program.setFloat2("String_Node_Str",(sunPositionScreenSpace.x + 1.0f) / 2.0f,(sunPositionScreenSpace.y + 1.0f) / 2.0f,true);
  }
}

Fixed version (ground truth):
@Override public void applyParameters(Material program){
  super.applyParameters(program);
  DynamicFBOsManager dynamicFBOsManager=CoreRegistry.get(DynamicFBOsManager.class);
  FBO scene=dynamicFBOsManager.get(DefaultDynamicFBOs.READ_ONLY_GBUFFER.getName());
  int texId=0;
  if (scene != null) {
    GL13.glActiveTexture(GL13.GL_TEXTURE0 + texId);
    scene.bindTexture();
    program.setInt("String_Node_Str",texId++,true);
    GL13.glActiveTexture(GL13.GL_TEXTURE0 + texId);
    scene.bindDepthTexture();
    program.setInt("String_Node_Str",texId++,true);
  }
  program.setFloat("String_Node_Str",density,true);
  program.setFloat("String_Node_Str",exposure,true);
  program.setFloat("String_Node_Str",weight,true);
  program.setFloat("String_Node_Str",decay,true);
  WorldRenderer worldRenderer=CoreRegistry.get(WorldRenderer.class);
  BackdropProvider backdropProvider=CoreRegistry.get(BackdropProvider.class);
  if (worldRenderer != null) {
    Vector3f sunDirection=backdropProvider.getSunDirection(true);
    Camera activeCamera=worldRenderer.getActiveCamera();
    Vector4f sunPositionWorldSpace4=new Vector4f(sunDirection.x * 10000.0f,sunDirection.y * 10000.0f,sunDirection.z * 10000.0f,1.0f);
    Vector4f sunPositionScreenSpace=new Vector4f(sunPositionWorldSpace4);
    activeCamera.getViewProjectionMatrix().transform(sunPositionScreenSpace);
    sunPositionScreenSpace.x/=sunPositionScreenSpace.w;
    sunPositionScreenSpace.y/=sunPositionScreenSpace.w;
    sunPositionScreenSpace.z/=sunPositionScreenSpace.w;
    sunPositionScreenSpace.w=1.0f;
    program.setFloat("String_Node_Str",activeCamera.getViewingDirection().dot(sunDirection),true);
    program.setFloat2("String_Node_Str",(sunPositionScreenSpace.x + 1.0f) / 2.0f,(sunPositionScreenSpace.y + 1.0f) / 2.0f,true);
  }
}