I have an iMac computer and I have a Samsung blue ray player. When I download a dance lesson to DVD, it will play on my computer, but not on my blue ray player. Movies and previously burnt DVDs also will play on my blue ray player. What do I have to do to get new burns to play on my blue ray? Is it some sort of a format issue? I’ve tried dvd+ and -, as well as dvd/rw, which i do a complete format, before burning.