I have (only) one DVD, that shows a black screen.
that particular dvd has a DVD menu with a bunch of small videoclips playing. I don't know if that's related.
If I switch from EVR (i.e. all automatic, red october) to default video renderer=VMR9 (red october with additional filters), then the problem is gone..
(hardware acceleration is unchecked, that option caused errors for a few other HD movies, not dvd's)
note that this problem only only happens on one (windows 7) PC with an older nvidia graphics board (most recent drivers).
on another pc (with a newer ATI card) I can leave all settings to automatic.