I know this sounds dumb,but is it normal for addon scenery to show up only when changing start location,and not in flight planer? ???I wanted to load a flight from Area 51 to the Antarctic bases I just downloaded.Both areas show up fine when I click "change location & search addon",but not in "flight planer",where "search addon" is dark.Is this the nature of the beast,or have I made a mistake somewhere ???Please advise,as Im close to yanking my hair out!!

Try FSNavigator to create your flight plans. It's updateable when you add scenery. It's payware unfortunately but pretty good at what it does.