Pure game, no mods or maps, version 3.1, crashes when selecting the map.
I just checked on version 1.2 (the map loaded a bit slowly at first, but once all the scripts were loaded, everything was fine)
I re-uploaded version 1.2 from my /maps folder into a clean version of Heroes 3.1.
Multiplayer: Господство, Извечное противостояние, Война за Магию, Торговая империя, Анатомия войны, Эксперимент
SingleScenario: Последний Рубеж, Трон, Элиралис, Вернуться домой!, Лабиринты разума
Campaign: Колонизация