Current questions and answers regarding the map editor.

Hello. Could you please tell me why the editor isn't working for me? I wanted to add a mentor to the map "Great Battle." The editor opens the map without any problems, but I can't save it. When I try to save, the files are only 1KB in size, even though the original file was 443KB. I've tried it without patch 3.1 and without the mod for faster gameplay, and it's still the same. What should I do?