Thx Richard...
The tearing issue seemed to go away after lots of messing about. However, I never got over the jerkiness issue.... I am incredibly frustrated by it... have tried everything I can think of in the xorg.conf and nVidia driver settings GUI tool to no avail... Have logged posts in the nVidia support forums and not received a single response. Have just written to Abit (integrated 7050PV) because nVidia don't want anything to do with people who have integrated chipsets!
Recently the tearing came back, its not as frequent as it was (used to happen continuously, now its just occasionally), so I am focussing on the jerkiness as this does happen pretty much all the time - any pans or zooms...
I'm sooo disappointed because as it stands the entire system is completely useless to me. The video is so much worse than the TVs internal DVB tuner, and media files worse than my old LinkTheater, that I cannot justify switching to it myself, much less to my other half!
BTW, I did solve the 60/50Hz problem I had with the Samsung TV.... I could easily get any number of modelines in xorg.conf for 1080p50Hz, but the Samsung would just spit the dummy, or overscan so much as to be useless. Naturally, Samsung ignored any attempt I made to get help from them until I threatened to demand my money back - they called my mobile 3 mins after I sent that email! They showed me a simple setting to get the TV to accept the signal - unfortunately 1) it has to be manually set every time I reboot LMCE, and 2) getting the TV refresh in sync with my media sources did not improve the jerkiness or tearing as I had hoped!
Col.