Sony bdps360 problem

I have just bought the sony bdps360 blue ray player and i have an issue. It wont play my verbatim dvd-r backup movies i made, it will not reconise them and comes up with error. It has played a dvd+r and in the manual it says it plays both - & r has anyone else had this problem??? I use dvd fab and my old 6 year old player will play all the movies