Hey, thanks for your post. I was having difficulty with my LG 60PA6550 and definitely appreciated the updates. Other people with LG TVs seem to be having similar problems.
Unfortunately, the menu with the Disc, VCR, HDD Recorder, etc, is grayed out when I press the SimpLink button. Looks like Chromecast isn't supported on my TV. After a number of resets, I was able to get it to turn the TV on. So if I leave it on the right input before turning off the TV, it starts playing immediately. However, we do use the other inputs, so that's a pain. If they get Plex support, we could use Chromecast instead of the WD TV Live, so that would mean it would usually be on the right input. Only other thing is Live TV from an antenna, which we rarely watch.
I've included extra detail since I've read that CEC can be very setup-specific. Maybe it's something specific to my setup. I did try without the WD TV Live, to no avail, but I never disconnected the antenna.
I'm not that hopeful that Google will fix this, as it seems like CEC isn't very well implemented or supported by the TV manufacturers, and it would probably be a nightmare to ensure compatibility for all the different models