Further to my post of 17 May, I am on PC not MAC but, as I said, symptoms are the same. I have done a lot of investigating to eliminate causes. I don’t know the cause but I am convinced it has nothing to do with media or hardware. Once I get a good build I can build to any type or make of DVD -R -RW reliably and using either a Pioneer or a Lite-on drive. On the other hand a ‘bad’ build will reliably give the bad result on any media or drive. I also find the ‘bad’ build will sometimes work on a particular DVD player but not on another, though, as I said, a good one works everywhere. To get a good build I started from one of the sample menus and button types supplied by Adobe. That works. The failure was made from my own .psd menu background and buttons, etc. However, many times I repeat that and manipulate it I can’t get it to work – though, of course, it works in the preview. I’ve read the manual many times. I suspect there is something going on in Encore that shows up unpredictably when a menu and buttons are heavily manipulated. Possibly an interpretation of the DVD specification has something to do with it.
Whatever the cause, Adobe check and preview is not performing its function of detecting the problem, so that’s definitely down to Adobe whatever the root cause. I’m not sure I can take this any further.