Just got my Panny ED plasma over the weekend (consumer version). Very happy...but then last night the following screen problem emerged: one area of the screen (from top to bottom on the right hand side for about five inches) was noticeably lighter colored than the rest. This was most apparent on dark backgrounds--the rest of the screen would be black and this area would be a lighter shade of gray. Weird. And then, two hours later, it simply disappeared! Does this sound familiar to anyone? What to do?