diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs
index 44e850bae3..6c89ac8c0d 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs
@@ -61,6 +61,10 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
 
         private void OnRegionUp(GridRegion otherRegion)
         {
+            // This shouldn't happen
+            if (otherRegion == null)
+                return;
+
             m_log.DebugFormat("[REGION CACHE]: (on region {0}) Region {1} is up @ {2}-{3}",
                 m_scene.RegionInfo.RegionName, otherRegion.RegionName, otherRegion.RegionLocX, otherRegion.RegionLocY);
 
diff --git a/prebuild.xml b/prebuild.xml
index f863ab64c6..e58b81b348 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -724,7 +724,6 @@
       <Reference name="System"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Drawing"/>
-      <Reference name="System.Runtime.Remoting"/>
       <Reference name="System.Web"/>
       <Reference name="OpenMetaverseTypes.dll"/>
       <Reference name="OpenMetaverse.StructuredData.dll"/>
@@ -805,7 +804,6 @@
       <Reference name="System"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Data"/>
-      <Reference name="System.Runtime.Remoting"/>
       <Reference name="OpenSim.Framework"/>
       <Reference name="OpenSim.Data" />
       <Reference name="OpenSim.Framework.Communications" />
@@ -1539,7 +1537,6 @@
       <Reference name="System"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Drawing"/>
-      <Reference name="System.Runtime.Remoting"/>
       <Reference name="System.Web"/>
       <Reference name="OpenMetaverseTypes.dll"/>
       <Reference name="OpenMetaverse.StructuredData.dll"/>
@@ -1624,7 +1621,6 @@
       <Reference name="System"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Drawing"/>
-      <Reference name="System.Runtime.Remoting"/>
       <Reference name="System.Web"/>
       <Reference name="OpenMetaverseTypes.dll"/>
       <Reference name="OpenMetaverse.StructuredData.dll"/>
@@ -1682,7 +1678,6 @@
       <ReferencePath>../../../../bin/</ReferencePath>
       <Reference name="System"/>
       <Reference name="System.Drawing"/>
-      <Reference name="System.Runtime.Remoting"/>
       <Reference name="System.Xml"/>
       <Reference name="OpenSim.Data"/>
       <Reference name="OpenSim.Framework"/>
@@ -3590,7 +3585,6 @@
       <Reference name="System"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Drawing"/>
-      <Reference name="System.Runtime.Remoting"/>
       <Reference name="OpenMetaverseTypes.dll"/>
       <Reference name="OpenMetaverse.dll"/>
       <Reference name="OpenSim.Data"/>