HDRW 720 playback issues on computer rcrd dvd

My hdrw 720 will no longer play dvds made using roxio software. The dvds were made 8 months ago and played then. Now when the roxio menu pops up after inserting the dvd I cannot open it to get it to play. The dvds play well in five other dvd players that I tested them on.
Has anyone else had this issue?