Never ending Repair / Fix Cycle
Riot - please.
Since this patch was introduced, every time I've finished every second or third game, I have been stuck with continuous attempts by the client to repair itself unsuccessfully. Each time, I get stuck with a black screen inside the window after the repair is done and I have usually have to reboot the client because nothing appear inside the window afterwards - even after toggling through what is left of the top of the window menu. Home, Profile, Collection, Loot, Play and Store still greet me with the Black Screen of Doom. (Has Karthus been doing some client development work for you guys?)
(I thought nothing would be more annoying than the one legged Garen animation or the fact that Fiddlesticks freezes partway into the middle of his dance regularly - but this takes the cake.)