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I'm having the exact same issue with a Sony sound bar. This only started happening since the last update.

So another day on 05.00.35 in Australia - still having the same issues with HDMI ARC/Optical sound out, also still having HDMI pop ups occasionally. Emailed LG, got told to call them, called, told I'll be called back the next day. Three days later without a call, called back and was told to take it to the closest service centre to have the hardware checked haha. Obviously it's a software issue considering all the people here in the same boat. I've requested the issue be forwarded to whoever is in charge of the software updates (Korea apparently), I've also submitted a complaint about the lack of service and after sales support. If anyone can shed more light on manually updating that would be excellent.

You would only use the coax in the TV if you're getting over the air on an antenna. Since you're using Comcast cable, HDMI will be your choice for watching TV. My TV comes with the Magic Remote and it works with cable box. Or, you can program the cable box remote to work with your TV. Ultimately, Harmony remote is the best. I don't use keyboard but I'm pretty sure it can't connect to your TV's bluetooth. The TV bluetooth would ONLY work with LG headphones. If your keyboard have an USB dongle then that may work.