Client freezing in champion select when trying to edit masteries.

This is a major bug that causes your client to crash whenever you try to edit your masteries in game. That on top of the entire client having weird visual effects like summoner spells, masteries names, chat, and other things being blacked out randomly.

This needs to be addressed asap because I've lost like a divisions worth of LP from my client freezing and it counting as a queue dodge.