More info about the Shervins issue:

I've debugged the code and compared with a working portal.

In the DotNetNuke.Services.FileSystem.FolderController:

------------------------------------------------

Public Function GetFolder(ByVal PortalID As Integer, ByVal FolderPath As String, ByVal ignoreCache As Boolean) As FolderInfo
FolderPath = FileSystemUtils.FormatFolderPath(FolderPath)
Dim folder As FolderInfo = Nothing
Dim bFound As Boolean = False
If Not ignoreCache Then
Dim dicFolders As SortedList(Of String, FolderInfo)
'First try the cache dicFolders = GetFoldersSorted(PortalID)
bFound = dicFolders.TryGetValue(FolderPath, folder)
End If
If ignoreCache Or Not bFound Then
folder = CBO.FillObject(Of FolderInfo)(DataProvider.Instance().GetFolder(PortalID, FolderPath))
End If
Return folder
End Function
------------------------------------------

In the working portal does the row (145) "bFound = dicFolders.TryGetValue(FolderPath, folder)" populate the "folder" object.
But it doesn't in the failing portal...it comes out as "Nothing" that makes the "Object ref not set" error
I've checked that the dicFolders contain objects and I can't see what's wrong here...
Please help
\Nicklas

Hi,

Thanks for your suggestion
I'm interested to solve the problem without upgdareing DNN. It's important to know the reason. There is no guaranti that the problem doesn't appear again.

Shervin