iDVD themes miss elements
Some of my themes, pre-7.0, don't play anymore and miss elements of the theme. It is the case for "Shelves" for instance, where I miss the shelves. The dropzones are present. Also, the background is sometimes kept from one theme when switching to another.
Of course, I have deleted the pref's and the cache, emptied the trash and restarted just to be sure. iDVD is 7.1.2 version.
Any hints what to do?