OS: Mac OSX
Bug: when pressing the combination of [command + H] which normally hides the client and allows you to do other stuff during the loadscreen, the game goes to a black screen and doesn't close or load. Upon attempting to reconnect you are greeted with the 'failed to establish connection to the server' error message with options to 'retry' or 'cancel' each which fail to fix the situation. Additionally even upon closing the client and logging in again, the bug persists. Riot please fix this bug, it happens when using the training tool as well as custom games.