there is no real reason to write this value back to estate settings,

and it is the most often tickled part of this race condition.

OpenSim/Framework/EstateSettings.cs

@@ -479,7 +479,11 @@ namespace OpenSim.Framework
             set
             {
                 m_terrainImageID = value;
-                configMember.forceSetConfigurationOption("terrain_image_id", m_terrainImageID.ToString());
+                // I don't think there is a reason that this actually
+                // needs to be written back to the estate settings
+                // file.
+                
+                // configMember.forceSetConfigurationOption("terrain_image_id", m_terrainImageID.ToString());
             }
         }