Hi Riot - this same thing happened to me. Let me say that this is UNACCEPTABLE. I have spent a lot of money with your game. I am an upset customer. You need to fix this for me. Your game turns a profit - so i expect some of repayment for my losses.
You have to understand that people including myself invest a lot time into this game, and when you get punished by bugs or incompetent QA and testing teams, it really hurts.
I hope you understand that this really sets people back and I hope you make it right for everyone.
The problem:
During champion select I got a black screen and couldn't interact with the client although I could still hear the sounds. I was last to lock and first to pick. I missed banning and i heard the count down timer for the last seconds to lock your champion. I heard it expire then I get queue dodge penalty. This is the bug: Black screen during champ select (can't interact with) but can hear sounds. The top bar with the minimize ? cog and close symbol is still present.