What is doing RIOT support ?!

When i'm logged in LOL, if i go in draft game, or ranked draft game or "loot and crafting inventory" my screen is converted in Black ! I read a lot of posts in this forum which concerns this "bug" for A LOT OF people ! But i never found an answer ! So i have to questions... How to fix my black screen problem ? What is doing LOL support for us for this black screen problem ? (as I said i saw a lot of posts without answers) Thanks
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