The GM still has audio issues! If I play an AVI file with QuickTime, the video and audio work fine. But if I launch and quit Plex, and then try to play the AVI in QuickTime (VLC and MPlayerX too) again, I get video, but no audio. The only way to solve the issue is to either restart the Mac or put the Mac to sleep and wake it up. Very annoying! Mac mini 2010 with HDMI cable to TV.