I did the D-Nice slides for the first 100 hours. I will frequently leave the TV on HBO or the Toy Story DVD during the day when I'm not watching something else, in order to age the panel more. I also run the scrolling bar once or twice a day, and the slides occasionally.
It's just weird to me that I used to see the logo only on the slides (where again, it would usually disappear pretty fast), but now I'm also seeing it on normal moving material (albeit briefly). Nothing like this ever happened on my 5-year old 50" Panny plasma. I even played a lot of games on that one for hours at a time and never noticed anything.