I just noticed that the exterior lights (nav, beacon, strobe) don't work regardless of the realism settings. I uninstalled FSX SP2 and the lights work as expected. Reinstalled (download from Microsoft) and the problem returned.Two questions, does anyone know what the problem is and how to fix it and if not what do I lose if I uninstall SP2?I'm sure this is a not a new issue but I can find no specific details on google or elsewhere.ThanksDavid

Installation of SP2 also removes the uninstall entry in add/remove programs. Unless you want multiplayer don't install it.