Hi, on one of my sites on dnn v5.6.3 and telerik v5.6.3 i get this error when i wants to insert an image or document. The telerik editor opens but without any files and folders:

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AssemblyVersion: 5.6.3
PortalID: 2
PortalName: Vilslev Hunderup sogne
UserID: 12
UserName: njhvhadm
ActiveTabID: 237
ActiveTabName: Konfirmationer
RawURL: /Providers/HtmlEditorProviders/Telerik/Telerik.Web.UI.DialogHandler.aspx?tabid=237&language=da-DK&DialogName=ImageManager&Skin=Vista&Title=Image+Manager&doid=aec28c81-27f9-40bc-8b42-2f1b1dc95a94&dpptn=&rwndrnd=0.08984384683383917
AbsoluteURL: /Providers/HtmlEditorProviders/Telerik/Telerik.Web.UI.DialogHandler.aspx
AbsoluteURLReferrer: http://vilslev-hunderup.dk/Providers/HtmlEditorProviders/Telerik/Telerik.Web.UI.DialogHandler.aspx?tabid=237&language=da-DK&DialogName=ImageManager&Skin=Vista&Title=Image%20Manager&doid=aec28c81-27f9-40bc-8b42-2f1b1dc95a94&dpptn=&rwndrnd=0.08984384683383917
UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 3b82ae61-4302-4647-94fa-f77e23887400
InnerException: Unable to complete operation. An unknown error occurred. Portal rod
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.ThrowHelper.ThrowArgumentException
StackTrace:
Message: DotNetNuke.HtmlEditor.TelerikEditorProvider.FileManagerException: Unable to complete operation. An unknown error occurred. Portal rod ---> System.ArgumentException: An item with the same key has already been added.at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)at DotNetNuke.HtmlEditor.TelerikEditorProvider.FileSystemValidation.get_UserFolders()at DotNetNuke.HtmlEditor.TelerikEditorProvider.FileSystemValidation.GetUserFolder(String path)at DotNetNuke.HtmlEditor.TelerikEditorProvider.PortalContentProvider.AddChildDirectoriesToList(DirectoryItem[]& radDirectories, Boolean recursive, Boolean loadFiles)at DotNetNuke.HtmlEditor.TelerikEditorProvider.PortalContentProvider.GetDirectoryItemWithDNNPermissions(String path, Boolean loadFiles)at DotNetNuke.HtmlEditor.TelerikEditorProvider.PortalContentProvider.ResolveRootDirectoryAsTree(String path)--- End of inner exception stack trace --- 

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I have tried to run a suggested sql script from the forum that converts all foldernames to lower case, whitout any luck. Can  u help me ?