Darius aa problem. causing a ranked game lose

I was excited to play darius.. I just got out of a ranked game very upset. it seems that his aa wont work. I get the cruiser over a minion or enemy champ and he walks to them instead of attacking them. and in a fight I could only use abilities.. not auto attacking on the enemy, even when clicked on.

I could not stack my passive. I could not farm well. and what is worse is I just lost a ranked game .... to a garen .... a garen.... I mean come on. I should of murdered him!

Please fix this!