Customized Publishing Styles during upgrades
For some reason, customized Publising Styles rarely work 100% correctly following an upgrade. It is best to re-create them from scratch in the upgraded Library, by taking a new copy of the default Publishing Styles and editing them. This may be because Oracle sometimes changes the format of the Publishing Styles from one release to the next, although the upgrade should cater for this. Sometimes they seem to work after an upgrade, but then somethig goes wrong later. To be on the safe side, always re-create. And always document your customizations so that you can recreate them later.