How old is your're Yahama DVD player? Make certain that it is multiread compatible, or as the techs call it, "backwards compatible", simply meaning that it has been developed to read both CD and DVD media. This may have no bearing on the problem but with that aside the field narrows. I haven't ran into this problem but my unedchewmakated guess is that these newer movies might be recorded onto DVD RAM, ROM, R or another type of DVD writable media. WHY, I dont know, but I do know that some of the newer forms of DVD ROM can hold up to and in excess of 8 Gigs of media.OH, one more thing.........if the disk wont read, clean it...if the disk won't play, check screen resolution.