Scenery FIles are messed up?

I am having a problem with my 2004 scenery files. It might have been caused by a scenery update to one of the mesh files I did a while back. The problem I am having is that the airports, lakes and rivers all are elevated from the main mesh. They all sit on their own little mountains. It is really weird. I have tried installing and uninstaling all my addon scenery files. I shut everything off leaving only the default scenery checked. Any ideas on how I can correct this problem? Or any advice as to what I should be looking for? The culprit addon my be the PA MEsh files or the USA land class addon. I am not sure. Johne-mail [email protected]