I have this error:
Internal Error: Too many pairs created, new pairs will be ignored. This is perhaps due to an excessive number of objects created at one location.:
UnityEditorInternal.InternalEditorUtility:HierarchyWindowDrag(HierarchyProperty, Boolean) UnityEditor.DockArea:OnGUI()
I was wondering what are pairs and what is considered excessive?
EDIT:
I found this in the Editor Log:
Unloading 215 unused Assets to reduce memory usage. Loaded Objects now: 24475. System memory in use: 335.8 MB. Unloading 6 Unused Serialized files (Serialized files now loaded: 2 / Dirty serialized files: 2) Updating assets/buildings/residence/4 story apartment.prefab - GUID: dc87e925ac217eb438fcd069893e5b66... done: hash - 4eef91ee15929cb2dc4df6d3a026968a Updating assets/buildings/transport/fuel station.prefab - GUID: 04fb481b4535a7a4da851742d77294a8... done: hash - ad62f89ca60b828870e8bdcf87c97cf6 /n
Therefore, their "update" converted my prefab into a single cube. I have made extra backups of my prefabs; just in case...