I recently recieved my third replacement and it used to have that flicker problem. (LG, both of the others were lg too and both of them had the yellow whatever) It can be described as waves or lines running downwards your screen. After installing the newest update it was not that dominant anymore. Another interesting thing was that the lines were now running from the bottom to the top. I' ve called a Genius and he gave me the hint to reset the PRAM and NVRAM. That worked out for me. Now I have a wonderful MBP SR screen. Puuuh!