Thanks for your reply. My dvd player is a Pioneer 656a which is new (i.e latest technology). I have also owned/tried high end players, the likes of meridian and Arcam, but the prob is still there. I think it could possibly be dvd technology, I have tried a radeon 8500 but no joy. Using it with a Barco 808 projector, have checked with excellently mastered disks. Thing is I never noticed it before until a badly encoded disk showed up the problem, no I notice it more 'cause I know what to look for!! If you own Monster Inc, go to the scene where sullivan is the toilets while Boo is having a private moment!! and look at the yellow toilet doors. These artifacts show up as semi circular banding/blocking. If you have this disk, have a look and let me know what you think. Anyway, what equipment are you using??
Thanks.
p.s I'm using Windvd.