Pathing top 4: (Meant to do top 5, but only remembered 4)
4) Your minions getting stuck at corners, and failing to follow you.
3) Your demigod pausing to dance around the corner, when it should be chasing noticeably slower target.
2) Your demigod won't find a path to main base, and gets stuck in the first tower cluster in Crucible
1) At one time my ally dropped out, and got replaced by an AI. SOMEHOW the AI managed to get stuck inside the health crystal in home base, at Crucible. There it was, crusified to the crystal, and stayed immobile in the base for the rest of the game. I think I won the game, as the AI was not feeding the enemy.