Is anyone else experiencing this? 2014 rMBP (i7/16GB/1TB SSD) connected to 2 x Thunderbolt displays in daisy chain configuration. Preferred sound output device is set to Monitor 1, all is fine until the computer is left to go to sleep, upon waking from sleep, no audio comes out of Monitor 1, despite going back into System Prefs > Sound > Output and making sure Display Audio is selected. Nothing is on mute, just completely loses all sound output from both OS X itself as well as apps. Only a reboot seems to fix this.