Update - sound now plays from the rear speakers, but now the centre speaker is acting up. No sound from it whatsoever. Again, all channels play correctly on the receiver's speaker test. Playing films in Kodi, proper audio formats still do not show on the receiver, only Stereo, StereoEXT and PCM. Choosing PCM, Kodi reports that it is playing video files in the correct format (ex. TrueHD, DTS-MA). But still no sound from the centre channel and nothing showing on the receiver. Obviously, with the centre speaker producing nothing, I am missing a lot of sound when videos are playing.