When I click to sort champions in the store by IP or RP nothing happens. The box doesn't get checked and the champions don't move around. I purchased Cass with RP and it didn't subtract the RP from the balance it shows at the top right. I played a game with her, then after the game the RP showed the correct balance, minus Cass' cost. The IP/RP sort still isn't working though.
EDIT: Now it is. Maybe just big lag? I've never see any lag like that in the store before. I waited a long time. I guess a few minutes of being afk fixed it.