Blurred horizontal lines on Virtual / nandub playback

[jaodeo]

hi,


God knows what ive done , but i must have added some sort of codec last night and now i have these bad horizontal lines when im edting with nandub or virtual dub...The picture is crystal clear when the miovie is still , but as soon as it starts to play ,these blurred lines appear.....

.....I know its something ive added or uninstalled,,, because i uninstalled every codec i was aware of , then added each neccessary codec one at a time.At one stage i cured the blurred lines , then i got clever and added some more .....now its back again

any clues please ?

[jaodeo]

to add......

-This particular file plays fine on divx , power dvd & tmpgenc.......only in Virtual dub /Nandub i get this block liney effect......Im sure its something simple.....i wasnt like it before .....

....come on guys , what have i done...