I have a panasonic home theatre system, and just recently the dialog audio has cut out and you can barely hear it from DVD's. The receiver has the dvd player/changer built in, and it no longer runs the centre audio channel (and possibly the two rear channels). I've checked connections, and everything seems fine with speaker wires. On the display for the dvd player, there's a diagram with the speakers, the Centre, Back L/R are lit, and the Front L/R aren't. The front L/R are the only ones working it seems. Also when I go into audio setup, the max it shows is 3.1 or 2 channel, even though the movies are in 5.1, I don't get the option anymore. I've looked through the settings, and I can't figure anything out to change that would affect it, and nothing PHYSICAL has changed in the connections that I can tell that would make them stop working. It's worked fine for like a year and a half, it's not a new setup. The model number is SA-HT720 on the Home theatre. Anyone have any idea what may be up? It's really annoying watching movies and not having dialog... lol.