I am attacking an oppenet's town which contains a Champion with the trait that Mass Curse gets cast upon the start of battle.  The tactical battle screen comes up, and then it freezes...Mass Curse shows at the bottom of the left-hand side (i.e. indicating "it's" turn), but nothing else happens...it doesn't go to the next unit's turn (I have reloaded and replayed numerous times, and have waited for as long as 5 minutes).  If I hit the "auto-turn" toggle (where you can turn auto-turn on and off) nothing happens...if I just autoplay the battle (other arrow button) the battle completes (after spending all my mana!)

Their champion then gets sent back to the next town they own, and when I attack that town the same thing happens again.

I am playing as Pariden....the AI opponenet I am attacking (which has the Champion with this trait) is Magnar, in case that matters.