Following my recent problems with KORS I decided that my installation was getting clogged up anyway, and set about a complete reinstall of P3Dv4. So far I have installed only the sim itself, TEGB(S) + Libraries, Orbx Global Base, Orbx Buildings and Orbx Trees, all of which went into Program Files\Lockheed Martin\Prepar3D v4\Orbx. Orbx Central refused to allow Objectfllow to go there and insisted on creating Program Files\Lockheed Martin\Orbx Library\p3dv4 where it lives in isolation, though seemingly working ok.
My first airfield addon was EGHA, and I have an elevation problem which I have not seen before, although I am familiar with the sunken area from before. Can you suggest which files I should look for and delete, please?