Can this TERRIBLE game client be fixed? Black screen, then game doesn't load.

Black screen after champion select. No amount of alt-tabbing can save me from the black screen. I reboot my PC, relaunch the game, and what do I see? "Game still in progress". ORLY? And are you going to load it? Obviously not. Game still in progress, but the client doesn't load it, great. Stuck looking at this "Game still in progress" message.
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