1- I created in the exact order 4 images: first, a background. second, an eye. third, an image with the "3D" word in it with cyan background color.Finally an image with the "2D" word in it with the same background color as the first image(the background).
2- Running the sketch: The second image button(the eye) is the only one that doesn't get overlapped by the first image(the background).
g4p tool builder. See the green-rectangled area to check the order of the creation of the GImage buttons.
Running the sketch:
regards