Hello, I recently installed this modified terrain to update some scenery, but when I flew out of Milwaukee (my hometown), Lake Michigan was gone! Replaced by farmer's fields. Putting backthe old terrain cfg brings Lake Michigan back from the dead. Any ideas?

Either the modified terrain.cfg you installed is incorrect, or, you have another add-on product installed which had made customised changes to the terrain.cfg which were overwritten/missing when you replaced the file.For example, if you have UTX USA installed, it uses customised terrain.cfg entries to provide its features e.g. water, road, rail, etc.. The modified one does not have these entries so you see anomalies like you report. Now if you do have UTX USA, then what you can do is install your modified terrain.cfg, and then start the UTX Setup Tool. During its self-test checks when it starts it will notice that its required terrain.cfg entries are missing and re-add them.Jeff