Current questions and answers regarding the map editor.

Guys, help me! I downloaded a map, but it's set for player vs. player. We want it to be 2 vs. 2. I'm in the map editor, I set it, close it, save it, but it doesn't change. Moreover, sometimes it even sets it so that everyone is on the same team, which never happened before, but now it's like that on every map... What's the reason? How can I fix it?:(