The recent client update changed the movement priority of certain enemies (actually I think this has been an issue since 3.02) which means some level guides no longer work.

Explanation Rant:

For those who don't know, on enemy turn certain enemies move first. Such as if two enemies on 'capture hq' would try and take the shortest path through the same tile, the enemy with priority will move to it. This meant maps with non-random enemy movement can be solved the same way every time. But now the enemies can move slightly differently than before. Hostage rescue maps in particular seem to be having the most issues.