Blurry DVD

I have a 6 or 7 year old Sony 57" rear projection HD TV hooked up to a JVC CD/DVD player.  The red lense  on the TV went out recently and I had it replaced by a professional repair shop. The picture is now great, as good as it was when new.

I put in a DVD and the picture for the trailer was great but when the movie started, the picture became blurry...3 D like without the 3 D glasses.

I was confused that the picture on the trailer on the same disc was great but the movie was blurred, but I thought it was the DVD player. I switched out the  DVD player with another and the same thing happened. I took the original DVD player hooked it up to another  television and both the trailer and the movie's picture were great on the other TV.

I thought maybe the format of the disc might have changed but was told by Netflick that nothing had changed. 

Last night I was playing around with the TV and the DVD, trying to figure out what could have happened... I made sure both the TV and the DVD player were on progressive...same blurry image,......both on interlaced...same blurry image.

I have a PIP feature on this TV....I was surprised to see the DVD image was perfect on the slpit screen, but when I went back to the full screen it was back to blurry.

Any ideas ?????