With Vista Home Premium, there is an issue in custom assembly. If I select several songs from directory "A", then try to add songs from directory "B", it will not permit them to be added.
Another bug is that when you save a custom assembled disk layout, the file name appears and you are able to retrieve it, but the song information is gone.
Both of these work fine under XP Pro SP2.

With Vista !!!

With XP Professional !!!
DC