I've run into the problem where one of my landscape piece disappeared. Went to remake it and nothing happened. So I made deleted the landscape and retried, nothing. Tried removing the SRTM files and reuploading them to the content, same results, nothing. I tried restarting U4, nothing. Please help me. Last time I fixed it by redoing everything from the start but I'm way too far gone to want to do that. Any help would be greatly appreciated.
You may need to make a careful note of which tile has disappeared then use explorer to find the relevant file and delete it, being sure that it is definitely the right one. Then you should be able to re-create it using the SRTM data.