I use to have this happen when I was using UTX, usually when I installed new scenery. As I recall you just need
to reset UTX.
Go to your Program Files, under Flight One, under UTX USA, open the Set Up Tool, let the Tool automatically
validate the UTX intall, click OK a couple of times when prompted, and see if that fixes the problem.
If you have more than one UTX area, you should probably do this for all of them in case there's other
new land masses like this you haven't discovered yet.
Hope this helps.
Thanks - Rob