Legends of Runaterra Not Launching (After login - White Screen Crash)

I was successfully playing LoR at the weekend but around Monday evening the game began not launching. When i launch it i get to the log in screen, put my details in and log in. The game window then pops up in a white window and then disappears, there is nothing in task manager and nothing else happens.

Does anyone know how i might be able to fix this? i've submitted a ticket to Riot but they aren't responding.