if you read my previous posts, my new 65" ST60 got burn-in caused by closed caption from apple TV. The TV is only 3 months old. a panasonic technician came and said there is another person in the neighbor city has the same burn-in because he played music.
it seems that 2013 models are easy to get burn-in, ST60 or VT60.
what size is your TV? if you can't get rid of burn-in, try to call panasonic and they will replace yours with a new one, like they did to mine. I am trying to watch full screen movie/shows for the first 6 months.
My TV is only 4 weeks old. I have also noticed some burn-in from a sporting event I watched 6 days after I bought the TV. This was the only time I watched that particular channel and the channel logo and scoreboard is still burnt in there from 3 weeks ago. The sports game only went for for 2-3 hours with lots of ad breaks where the logos were not on the screen.
It's a 65" VT60, I'll call Panasonic but I bet they try to blame me. If I put the TV on a pure white screen I can see all sorts of discolouration from different types of IR/burn-in, not a pretty sight.
I'm also in Australia if that makes any difference