interesting thread. I recently bought a LG42PJ350 and mine plays avi files but not MKVs, even though it states on LG's website that it plays MKVs. This is a great TV my only gripe is that I've only had it for 3 weeks and I watch BBC World News on it for around an hour every morning - yesterday I discovered the BBC logo had burned-in to the screen. Pretty annoyed after only a few hours of use. I'm hoping it'll disappear over time, I'm now watching the BBC with brightness and contrast right down and zoomed in to avoid making it worse. Anyone else have experience of IR or Burn-in like this?