NAD T531 Won't Play DVD

[Hal]

Hello all. I have a NAD T531 DVD/CD player. I've had it for some time now and have been pleased with it in general. However, this weekend I rented a DVD and all the NAD menu could / would bring up was the selection for directors comments, trailer, etc. - in other words all the extras and not the film itself. I played around with menu and could not find the film.

I thought that there should be two DVDs in the case so I took it back to the video store. The attendant popped the DVD into there machine and the menu came up for the film.

Why would not this work on my NAD? The only thing I could determine was that the DVD was a dual layer DVD. Could this be the issue? My owner's manual for the T531 does not mention dual layer DVDs. I have an email in to NAD but they are usually slow to reply.

Thanks for any thoughts on this issue.