In their reply to Rtings, LG admitted that there is still a variance in their panel manufacturing which can result in increased suceptibility to screen burn. (This is separate from the calibration look-up table issue). Anecdotally, it seems that most people are not seeing any problems, but some are, even after just a few weeks. LG are now including screen burn in their warranty, but only for one year. Retailers such as JL specifically exclude screen burn from their warranty.