The Heroes Round Table

I'm new to HOMM6. Have managed to get to level 17 and an currently in campaign 3. I had a few bug problems initially so downloaded patch 2.1, apparently successfully but notice that the mana required to cast Life Drain, Mass Life Drain and also the just acquired Summon Dark Elementals is ridiculousl...

[quote="Ribannah"]The mana cost of Life Drain keep going up.[/quote]

I found this too, also the Summon Dark Elementals spell - now need 11,667 mana on level 17 for all 3 spells!

Has anyone replied on this point?