Map generation using the alternative IRMG map generator.

I have the following problem:
When I try to load a saved game from a map created in IRMG, the game crashes. What could be the reason?

Since version 1.6.6, external dwellings have been added to IRMG, following the principle of Heroes of Might and Magic III - Windy and Moz. It seems that the TE (Town Editor) has been adapted to these changes. I believe that the game cannot load without the specified mod.
Besides dwp, sir_moz, vindikator, or JonnyP might be able to provide a clear explanation.
I also recommend checking the forum http://forum.heroesleague.ru/viewtopic.php?t=20679&start=0 from page 14 or http://forum.heroesleague.ru/viewtopic.php?t=7029&start=0 within the time frame from October 2012.