try manipulate with hdmi cable ... there on all my boxes all works well. Did not connect to TV some new hdmi device ?
There in CEC setting is newly added DEBUG to file. Try enable it (set path to /hdd ), then try several On/Off box and see there in Info-> About - Troubleshooting - find hdmicec.log, if is empty or non empty. ...may be, place it here.
Edited by ims, 18 March 2017 - 01:52.