I fixed the problem after some more proving. So if you looked at the original message and couldn’t answer because you either didn’t know or haven’t encountered it, this is for you.
Usually in Adobe products, a lot of problems are fixed simply by clearing the cache. I didn’t find an option to do so in Encore, so I had to do it manually. For the motion menus and other animations, go into the project’s “source” folder and then into the “menu” folder and delete the .mpg video files and like-named .xmpes files (not the PSD’s, you need them to create the menus). These are the renders that Encore generates. When you reopen the project and try to build again, you have to re-render the motion menus but it will definitely work now.
Also, just as a free Christmas bonus unrelated bug work around: when you close and try to restart Encore (in Windows at least), sometimes it will not open back up. This is because for some reason part of it is still running. ctrl+alt+delete to get the Windows task manager and look in the processes tab for something named Encore DVD something something, and stop that process. Now you can restart Encore. I encountered this a few times when trying to fix this project. Gee is Encore buggy or what?
Mike Browning