I updated page_title from 7.x-2.5 to 7.x-2.6 this afternoon on my development instance. After running the database update script and clearing all caches, and before I pulled to production, I noticed all my custom page titles had been removed (see attached screenshot). Furthermore, the list of patterns in Configuration > Search and metadata > Page titles is now empty (see attached screenshot).
I'm running Drupal 7.12. Any ideas?