I have the same issue on my setup, 7MC –> AVR –> TV all via HDMI. I do not power down my HTPC, just a “stop” command and power off the AVR and TV. I have 3 different issues…1) Sometimes I get a wonky resolution, which if I exit and restart 7MC, all returns to norm; 2) Blank screen v1 which can be resolved by changing inputs on my AVR or power cycle the AVR (I think both of these are EDID issues?); 3) The black screen o’ nothing per the OP. For that I have to use Windows+L, login screen re-appears, and then I can get back into 7MC.
