I'm trying to install DNN on my Vista machine to do some local testing and evaluation of the product.

I've gone down the WebMatrix, Web Platform Installer route and followed the tutorial video on this site.

It all installs without any errors what so ever.

The problem is it runs soooo slowwwww, literally clicking on any button will rsult in a two minute wait. I've managed to change the skin to an Artisteer one and do some tinkering, but it's almost unworkable.

I have a reasonable fast pentium machine and none of the resources seem to be straining.

One thing I've just noticed in the Databases section of WebMatrix is that if I expand the SiteSqlServer node, Tables,Views and Stored Procedures all show exclamation marks.

The error being as follows, is this the cause of my slow wows and how do I fix it! Many thanks in advance, a DNN newbie!

Unable to cast object of type 'System.DBNull' to type 'System.String'.


ResourceName:
Microsoft.WebMatrix.Server.WebManagementServiceException: Unable to cast object of type 'System.DBNull' to type 'System.String'. ---> System.InvalidCastException: Unable to cast object of type 'System.DBNull' to type 'System.String'.
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.GetDbCollation(String dbname)
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.GetDbComparer(Boolean inServer)
   at Microsoft.SqlServer.Management.Smo.SqlSmoObject.InitializeStringComparer()
   at Microsoft.SqlServer.Management.Smo.AbstractCollectionBase.get_StringComparer()
   at Microsoft.SqlServer.Management.Smo.SchemaCollectionBase.InitInnerCollection()
   at Microsoft.SqlServer.Management.Smo.SmoCollectionBase.InitializeChildCollection(Boolean refresh)
   at Microsoft.SqlServer.Management.Smo.SmoCollectionBase.GetEnumerator()
   at Microsoft.WebMatrix.DatabaseManager.SqlDatabase.SqlDatabaseProvider.GetStoredProcedures(String connectionString)
   at Microsoft.WebMatrix.DatabaseManager.IisDbManagerModuleService.GetStoredProcedures(Object databaseConnectionObject, String configPathState)
   --- End of inner exception stack trace ---
   at Microsoft.WebMatrix.Client.SharedMemoryChannel.InvokeInternal(String serviceName, String methodName, Object[] parameters)
   at Microsoft.WebMatrix.Client.SharedMemoryChannel.Invoke(String serviceName, String methodName, Object[] parameters)
   at Microsoft.WebMatrix.Client.ModuleServiceProxy.Invoke(String methodName, Object[] parameters)
   at Microsoft.WebMatrix.DatabaseManager.Client.IisDbManagerModuleProxy.GetStoredProcedures(DatabaseConnection connectionObject, String configPathState)
   at Microsoft.WebMatrix.DatabaseManager.Client.ClientConnection.get_StoredProcedures()
   at Microsoft.WebMatrix.DatabaseManager.Client.StoredProceduresHierarchyInfo.GetChildrenInternal()
   at Microsoft.WebMatrix.DatabaseManager.Client.DatabaseHierarchyInfo.OnChildrenLoadingStarted(Object sender, DoWorkEventArgs e)

i am experiencing the same problem. i cannot access any tables in my dnn database using webmatrix. will there be any response to this issue? getting "Unable to cast object of type 'System.DBNull' to type 'System.String'" and when i try to expand the tables i get a red exclaimation mark and the word "error.