[GAMEPLAY] Cant edit my masteries on the champion select

Since the client update, when I'm on the champion select, i try to create my Masteries and I simply cant.

Anyway I try to restart the client, before I start the game I cant create the Masteries, but after that, when I start a New Game, again, I cant edit my Masteries, and even after the game is finish I cant edit them.

This happened 4 games in a row and it's still not fixed!