"Best of the Best" Tournament

Since Killa lost all his data, I sent him a map from the maps\ folder, templates from UserMods\, and the latest saves (manual and autosave) from the Saves\ folder. All saves were made when both were in the game. Can other mods located in the UserMods folder possibly affect this?

Of course they can affect it. Both players must have only one mod in their UserMods folder and nothing else, and it is essential that this mod is identical for both. Another thing I personally encountered is that both on HeroesWorld and on the League, offline tournaments are held. So, if I download a map and a starting save and start playing through it, even for a couple of days, then sign up and go play online, after, say, being disconnected from the game, I cannot access the save at all — it says "checksum does not match and recommends checking mods and patches". I simply delete the map I downloaded for offline play, the starting save, and all subsequent saves, reload the game, and everything is fine. To put it shortly — clear out both the maps folder and the saves folder completely in both instances!