Sometimes, databases in KB seem to be changed to zero-title databases without notification.
For example, "Optica Conferene Papers" was changed to zero-title database and there was no notification through "Knowledge Articles" on Knowledge Center or "Knowledge Notification" on Client Center.

Since it may be possible to use other databases to register titles recorded before one database changed to be zero-title one, I hope that notification through "Knowledge Articles" and "Knowledge Notification" to be published whenever Ex Libris makes databases a zero-title ones.