WHY burned dvd menu wont come up on Sony DVD Player?

I have burned a few DVDs using vegas movie 11 and DVD Architect. In all of them they work great on my magnavox and Prima dvd players and even my Sony Bluray player. But none work properly in my sony dvd recorder/player RDR-HX730. Now EVERTHING ELSE I have played for 3 years has worked properly in this sony machine. I have burned disks using many dvd recorders and a dew computers. Even the disks I have burned using PMB ( the software that comes with my sony hd camera) works with this machine. Normally I press menu and I get the disk menu and this has worked for 3 years. But with the new disks ive burned with dvd architect I press menu and the screen goes to black for 1/2 second then returns to what was on. I have to press play then the burned movie starts to play then I can press menu and get the menu. Now if it is this machines fault - why has every other disk worked for 3 years??