I have installed some repaints into FSX lately that do install, but sections of the repaints appear darker than the rest of the aircraft. So far I have seen this with a repaint for the CS 737 and just today with a repaint for the Carenado 172.
Doors and rudders or other sections have color, but are much darker than the aircraft's other sections.
I looked at my settings in display for FSX but didn't ssee anything that would explain it, and changing quality settings or resolution doesn't change it.
I have a nVidia Gforce card in win XP on a 2.2GHZ Athlon machine.