This setup worked fine with El Capitan (2 Thunderbolts->HDMI + 1 HDMI = 3 Monitors). Once updated to macOS Sierra - as soon as I plug in 3rd monitor (no matter what order) - it freezes entire system. MacBook Pro 15 (Retina, Mid 2012) Anyone else had similar issue ? Anyone is running such setup fine ? Safe boot mode does not help.