Screen Darked out after chosing Summoners spells

Hi, Since last 6.1.16 update i got (not all the time) an annoying bug, when i click on a summoners spell (one of the 2 displayed) the screen just dark out and .. that's all ... stay like this till i Alt+F4. All is running correctly, i can see other player talking in chat, chosing their things .. but i can't interact with the interface. I'm already in leave buster 30 mins ... because of this bug.. someone else havd this annoying problem ?
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