No idea if this will help anyone or if it has been talked about but I will post this in case it can help anybody.
When I first hooked up the darbee I had a handshake issue with my cable box when I ran it though my avr. It worked if I went straight to the TV but if the avr was in the loop it just blinked and said it wasn’t authorized or something. Everything thing else worked perfect. I did everything I could think of but it still didn’t work.
I solved the problem by getting an hdmi switch box ($34 monoprice). I ran the cable box output to one input then ran the hdmi out on my avr (where everthing else was hooked up) to another input. Then ran the output on the switch box to the darbee. Then to the splitter then to the tv/projector. To get sound to the avr from the cable box (only) I just used the optical out. Not a big deal being that cable doesn’t have HD audio.
If you have this issue and didn’t understand the above let me know if I can help.