It was just acknowledged on Tweeter: “@TwitchSupport We’re investigating issues with Group Chat. Apologies for the inconvenience. ^JM 4:33pm · 11 Aug 2015”
Ref: https://twitter.com/TwitchSupport/status/631201907705380864
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And to close this out:
“@TwitchSupport 3 hours ago Issues with group chat should be resolved, apologies for the inconvenience! ^DA”
Ref: https://twitter.com/TwitchSupport/status/631242117944246272