We have a complex database structure in SQL 2012 / SDE 10.1. The custom client piece that is installed in ArcGIS Desktop just got upgraded from Desktop 10.1 to 10.2.2. Things have been working fine and our users have been entering data but yesterday morning the app started hanging. Not only that but ArcCatalog will hang just trying to view the table. Like all the tables in the databases it's registered with the Geodatabase and versioned. The table does take part in several relationship classes. Any ideas what could happen to the data that would make ArcCatalog hang?