at this momment we fit the dvdmenu object into a fixed width/height on the orbiter. it's not a standard 4:3, 16:9 dimension.
as a result, the dvd menu will look weird/streached sometimes.
we come to this because, we couldn't match the mouse click with the dvd menu obj, meaning sometimes if you wanted to click 'play' in dvd menu, the orbiter didn't trigger any events, the clickable area wasn't over the button (over the button that you see on dvd menu).
and, we came to this behaviour.
but, we'll need to go further and fix this, we added a bug report in our system newbielink:http://plutohome.com/support/mantis/view.php?id=1370 [nonactive], and we'll try to came with a better solution.