Riot for some reason will not let amumu be traded during any of my games. I've happened to be first pick a few times in a row now, and someone always says to ban etc. and pick amumu, which I do. However, when it comes time to trade, the game will say that the trade failed or simply be non responsive. It has really messed the matches up. Is it just coincidence, or has anyone else had this issue?

This might be better to put on the bug page. Either that or they don't have Amumu. "Awww okay."