Hi, I have only recently had this problem.
It cant have anything to do with my system, because I have had FS2002 for about 2 years and only just had this problem.
When I go to an airport, the runway is fine but all the taxiways flash, from the texture of the concrete to the earth below it.
(Oh, by the way it isnt the problem where you taxi over the apron and as soon as you move over it is changes to grass)
The other problem started at the same time, and is that parts of my aircraft just go. So I might end up with bits of the cockpit, and the wings, but no engine or body of the aircraft.