Since I started this topic 10 years ago, I'll add a recent, crazy discovery: if, on a map with no other players but with moving neutral creatures, you repeatedly skip your turn, after some time the player will be able to move on the map simultaneously with these neutral creatures. This happens because the turns are delayed; the neutral creatures don't have time to finish their turn before the next skip, and the game doesn't wait for them. As a result, this leads to rather absurd contortions of the neutral creatures on the world map and sometimes allows you to start the same battle more than ten times. Moreover, after one of the battles ends, the second battle may take place on the world map with a broken display. Part of this is demonstrated here:
Another crash that is quite difficult to explain. In a battle at high game speed, if the hero has a flaming arrow and the battle ends with damage dealt to himself, the game doesn't have time to register the damage to the hero before exiting the battle. You hear the sound of taking damage, followed by a crash. And this is just a small fraction of what I've found, perhaps for the first time in years of activity.