This afternoon we began migrating some sync databases to new servers with more capacity. During the migration, replication failed before all data had been copied. As a precaution, we've disabled sync for the following document types (to prevent possible data loss): Bibliography, Clippings, Favorites, Guides, Handouts, Hidden Resources, History, Layouts, Library Metadata, Personal Books, Preferences, Resource Collections, Sentence Diagrams, Word Lists.
Other documents (including Notes and Reading Plans) are syncing normally, but you will see a "red triangle" icon in Logos Bible Software due to the sync services mentioned above being offline.
We are currently investigating multiple approaches to ensure that the latest synced data is preserved, and will update http://status.faithlife.com/ and this thread with more news when it's available.