Shaders Three-layer surface shader stack

[jf_knight]

I'm implementing three surfaces and applying a shader to each. However, only the first and last shader seems to appear, the second does not.
They are order-specific.
Am I doing my shader stack wrong?

obj_target DRAW event

if !surface_exists(main_surface)
{
    main_surface = surface_create(sprite_get_width(sprite_index), sprite_get_height(sprite_index));
    glow_surface = surface_create(sprite_get_width(sprite_index), sprite_get_height(sprite_index));
    tilt_shift_surface = surface_create(sprite_get_width(sprite_index), sprite_get_height(sprite_index));
}
else
{
    surface_set_target(main_surface);

    shader_set(shd_edit2);
    draw_surface_ext(tilt_shift_surface, 0,0,1.0,1.0,0,c_white,1.0);         
    draw_self();
    shader_reset();
    surface_reset_target();

    shader_set(shd_edit_glow);
    draw_surface_ext(glow_surface, 0,0,1.0,1.0,0,c_white,1.0);         
    shader_reset();
  
    shader_set(shd_edit_tilt_shift);
    draw_surface_ext(main_surface, 0,0,1.0,1.0,0,c_white,1.0);
    shader_reset();
}

 

[RefresherTowel]

Well, it doesn't look like you're drawing anything to the glow surface?

 

[jf_knight]

Well, it doesn't look like you're drawing anything to the glow surface?

Yup! Found the answer to my problem...
It works now.