I've just tried now, both starting from 27R and landing on 27R, and there are no problems with the scenery.
It must be some other scenery in conflict. What kind of crash are you seeing ? AI crash, ground crash, water crash ?
You said you are using WoAI, which is using FS9 models: are you seeing the AI ? Because, if you have airplane shadows turned on, you might not see the AI, but you would still crash on it, if the crash with other airplanes is active.
However, since I had a chance today to reinstall a system from scratch, I was able to test on a brand new installed FSX with KFLL and nothing else so, I'm sure the problem is not the scenery.