Surely not a problem of the scenery, and nobody ever reported this so far. It's really sounds like a video driver problem, either upgrade your video drivers to the current version and, if you already have done that, reset all their settings to default, perhaps you have a tweak that shouldn't have been applied.
If that fails, try to remove the FSX.CFG into your %APPDATA%\Microsoft\FSX folder, this will force FSX to recreated a brand new one with default settings, which might fix also FSX tweak gone wrong.