IIRC they mentioned that there's an issue in the creep AI in this build--after attacking demigods, creeps get stuck sometime. Is it that, or is it something more insidious?
Well they don't exactly get stuck, they just stop advancing on their own. However, if and when a demigod or enemy appears near them, they all mob on it until it is dead, then they stay wherever they happen to stop...rinse and repeat. I actually had a match going with a nightmare AI for over an hour and a half before I finally called it quits because it was impossible to advance. Constant stalemate.