OK, so I take my 'deadly' army into the Bhinadmi fissure. And one of my heroes attempts to cast a fireball spell (from a safe distance). But he can't complete the spell, since (1) Abeix's current tile is 'blocked' (I assume that's a feature, not a bug -- no directed spells would touch him, though indirect ones -- like Storm and Pandemoneum -- got through just fine), and (2) I have to target an enemy.
And I'm stuck. Even autoplay (my usual tactical bug workaround; I turn it on, then quickly turn it off) wouldn't progress anything. In the end, the only thing that would let me move forward was the 'autoresolution' button, which killed off my entire army. Fortunately, I had saved the game before I started the battle.
I know 0.87 is about to come out, but for what it's worth. ..bruce..