Have a question for the experts. I recently purchased a Panasonic TH-37PX50U and have noticed that when watching 4:3 programs stretched to JUST (16:9) there is a significant parabolic effect on each side of the screen. I also own a 42" pd25up panasonic and notice that it is not as pronounced yet still there. Finally I own a sony 17" HT75W LCD HDTV/Monitor that I use as a monitor and TV in the office, and this has no parabolic effect. What causes this and is it normal? Is it the glass that causes this or do I possibly have a defective unit? Any insight is appreciated.