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Hey Riot people in charge of Mac Client, minor bug to report.
When in the loading screen after champ select, if you Command-H (Hide) out of the loading screen, going back to it will leave you with a black screen and the need to restart your client. If you Command-Tab however it works fine.
I would imagine its an easy fix, but at least theres a simple workaround. Just thought I'd bring it to your attention!