Strange thing happening in DVD arch - I have a animated background on my main menu. Works great. I then created a sub-menu with the same background file - but in preview, it stutters. Not sure if this is just preview mode or what will happen when I burn the disk. Any ideas?

in the submenu, did you use the original file? If so, it might be your computer can't play both back. I always render separate files for my buttons, and make them smaller anyway, ie' 360 x 240