WORK IN PROGRESS, GET THE STABLE SOURCE FROM THE DOWNLOADS TAB

Merging into main 4.1.0 branch:

Resolves a number of open issues, see associated WorkItems
- Fix WP crash on invalid connection string due to generation of XML cache on a separate thread
- Added option to generate xml cache file on local filesystem (in ASP.NET Temporary Files / CodeGenDir location) by adding <add key="umbracoContentXMLUseLocalTemp" value="true" /> to web.config file. This allows you to run from a SAN on a load-balanced environment whilst allowing each web node to have isolated copies of the xml cache file to avoid WP crashes due to multiple file locks
- Others in WorkItems :)

[TFS Changeset #64002]

umbraco/presentation/requestModule.cs

@@ -232,7 +232,18 @@ namespace umbraco.presentation
                         else
                             error = "No Context available -> "
                                     + mApp.Context.Server.GetLastError().InnerException;
-                        Log.Add(LogTypes.Error, User.GetUser(0), -1, error);
+
+                        // Hide error if getting the user throws an error (e.g. corrupt / blank db)
+                        User staticUser = null;
+                        try
+                        {
+                            User.GetCurrent();
+                        }
+                        catch
+                        {
+                        }
+
+                        Log.Add(LogTypes.Error, staticUser, -1, error);
                         Trace.TraceError(error);
                         lock (unhandledErrors)
                         {