Oh true. I just realized I have the same issue. I connect my macbook to my hengedock which has 3 monitors attached. If I disconnect my macbook and hook up my tv

Oh true. I just realized I have the same issue. I connect my macbook to my hengedock which has 3 monitors attached. If I disconnect my macbook and hook up my tv via hdmi, I plug it into my hengedock and my 3rd monitor is just black while plugged into that hdmi port. I always restart it after watching tv and then plugging my monitors to get it to work.