I limited to 1080 both netflix and inputstream addons, since my TV is fullHD, but the same issue: If I play any file from my HDD everything is OK, but if I play a netflix video, lights work ok but TV image is black with the notification: "Invalid Signal resolution". The funny thing is that if I connect with VNC I can see that netlfix is playing OK... and also, if I stop the netflix video the screen doesn't come back, I need to reboot the Pi.
Next I'm going to try deactivating hyperion before playing a netflix video.
YES ! Exactly what you have to to! and youll see, with deactivate hyperion addon works great.
Videos from HDD / NAS works fine!
Only with netflix (VOD) combined with hyperion and 1080p software decode you got black screens!