If VAL isn't launching or is launching into a black screen after the latest patch, first try restarting your PC. If that doesn't work, a clean reinstall of your graphics drivers may resolve the issue. We hope this helps while we work on a fix.
Due to a recent backend system update, some players have received a Name Change notification despite having an appropriate Riot ID. If this happened to you, check Changing Your Riot ID to see what you can do (like keeping your game name!) and can't do (like using the original server tagline, eg. NA1, EUW1, etc). And sorry for the inconvenience—some decade-old systems just won't modernize without a fight.
You can report a player after a match by going to your match history.