I seem to be having some problems with CEC where during playback or sometimes if left idle for long enough the CEC commands no longer seem to be recognised - I press a button and get no response and if I press the "select" button the TV responds as if the rPi is no longer a connected CEC device.
I have been using raspbmc successfully with CEC for many months with none of these issues so I am assuming there is a bug somewhere perhaps causing libcec to crash and not be restarted? Has anyone had similar issues?