Second time today, after choose the champion i wait until the game loads the second screen before the game start BUT appear the same window size of the champion selection window all black; and here i cannot do nothing.
I tried to close it, run antivirus,restart pc, close all programs but nothing.. pls help me is frustrating... :S

PS: and i had second leave in 1hr :S

im having this problem too, it's very annoying. i tried everything like disinstalling and reinstalling but it still doesnt work

Same,now im just waiting for a reply from support to my ticket.

Read alot of complaints about this problem and havent played for 3 days :s

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i know it is a little late to post on this thread but it is still #1 on google search so everyone with this problem will check eventually.
i had the same problem. i had to repair the launcher everytime i started the game, which took ages from my life, then downloaded npswf32.dll and put it into system32 folder. it worked fine with me.

I´m starting to get crazy about this. Would apprecciate an answer from Riot so much ...

Good luck with that. I've been having a similar issue (except my black screen minimizes, but can never get to loading screen). It's been over one week and haven't been able to play at all.
The ticket I sent to RIOT was handled pathetically, to be honest. Basically, a lot of players here are unable to play for several days or more. And so far, any of the few solutions that popped up didn't work for me, nor Riot's.

all windows 8 users?
because i have the exact same problem with windows 8..

Hi,

Have you tryed to reinstall the whole game - that might work.