Current questions and answers regarding the map editor.

Okay, try opening the map in the editor and clicking "check map" (on the top panel, it's a red button with a green checkmark). What does it say there? Do you have at least two players on the map? In general, I advise you to create a new map in English, place two heroes (player 1 and player 2) on it, then set the maximum level for the heroes (in map properties), and then try to launch it. If the new map appears, the problem is with the old one; if not, the problem is with the editor.