DVD Picture Issues

Didn't see a Tech area for posting this type of question so please forgive if it's in the wrong spot.

Just bought a new amplifier yesterday because I was sick of the crappy sound I was getting with DVD's and my old NAD Pro Logic amp.

I got a Harman Kardon AVR 255, great amp really happy with the sound and picture upscaling etc.

I am running Component Video out of my Panasonic DMR-ES30V which is a VCR/DVD Recorder combo unit. This is then going HDMI out of the amp to the Panasonic Viera Plasma.

The problem is, when I play older DVDs the picture jumps up and down, kind of like a shimmer, pinstripe lines at extremities of jump.

Only happens on older DVDs though, I can Play Transformers for example just fine, but Shrek not.

Thanks in advance for any ideas.