From time to time there are issues with DirecTv boxes and certain models of TV. Some of those get fixed by new DirecTV firmware, some by new firmware in the TV. This is nothing that DirecTV "has been aware of for a couple of months" nor is it something that "DirecTv is looking into", it's just an issue that comes up occasionally. Other set top box providers (including cable) see these problems occasionally as well. I haven't seen anything posted about Panasonic recently but with so many new models of TV appearing all the time you never know when someone is going to use an HMMI chip with incompatibilities.
Component video should be just as good as HDMI by the way - and I hope you did not buy an expensive HDMI cable by the way, they are just a rip-off. You will not get any better picture quality with a 6ft cable that costs you $100 than you get with the one the DirecTv installers use. If you need to buy your own cables, go to monoprice or bluejeanscable.