So almost every day I Airplay Mirror my 2011 Mac Mini's Desktop to my TV via ATV3 - Tonight I am only getting audio from my computer and a black screen. I can hear the audio perfect, but no picture at all. I've never had an issue with this until now. I tested - If I Airplay via my iTunes on the same Mac Mini I can play movies / tv shows, If I Airplay via my iPad or iPhone, it works perfectly. Anyone else experiencing this or can tell me what's going on? Thanks.