a) SatelliteComponent does not render a background. Since it is doublebuffered, this means that one gets glitch-graphics if the scene scales to smaller than the satellite view.

b) SatelliteComponent overrides paint() instead of paintComponent().

Replace the top part of paint() thus:

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D gr = (Graphics2D) g;

        Dimension size = getSize();

        if (isOpaque()) {
            gr.setPaint(getBackground());
            gr.fillRect(0, 0, size.width, size.height);
        }

Really, the background should be rendered by a ComponentUI or something, but this at least stops the graphics glitching.