This site is being deprecated.
Please see the official X‑Plane Support page for help.
Looks like a common case of "oops I forgot I was editing that". Assuming that is, that you have no add on scenery involved with the issue. the bug reporting form is located here: http://dev.x-plane.com/support/bugreport.html
Make sure you follow the directions and Happy flying
This site is no longer being actively maintained.