Some movies i've got will play ok but after a few minuites the size of the movie shrinks to about 2 3rds of it's original size. This happens whether it's in fullscreen mode or not. I had this problem with the Pluto Nash film and i sorted it out but for the life of me i can't remember what i done. This movie used the Xvid codec which i've got and i've re-installed it but that dosn't work. Can anyone help?