New Player problem

I just purchased a new Magnavox NB500MG1F as a second player, so far it has not played my backups in DVD5 or DVD9, plays the original though, am I doing something wrong or does this player really not accept these disks?

You should look through this thread at doom9 regarding compatible players, and the various strategies needed for some players. http://forum.doom9.org/showthread.php?t=144674

Your particular player isn’t listed, though there is one similar, which is said to work with movie only backups using BD structure on dvds.