Wallew, thanks for finding this. The issue is not completely clear. Personally, i've had similar issues in upgrading previous dnn version, and always tried to submit proper sql fixes to the core. From what i've seen there can be any number of reasons why the files / folders table and the corresponding permissions become corrupt... anyhow, this would be a good one to check in upgrade scripts.. i will follow up on that...

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I am listing these seperate because I don't know if all are really needed.  You could run one insert at a time and test the results.

WARNING!!  This code is posted as a coutesy and has NOT been fully tested.  Use at your own risk!

---Begin Script---

INSERT INTO [FolderPermission]
           ([FolderID]
           ,[PermissionID]
           ,[RoleID]
           ,[AllowAccess])
     VALUES
           (1
           ,5
           ,1
           ,1)

INSERT INTO [FolderPermission]
           ([FolderID]
           ,[PermissionID]
           ,[RoleID]
           ,[AllowAccess])
     VALUES
           (1
           ,5
           ,-1
           ,1)
INSERT INTO [FolderPermission]
           ([FolderID]
           ,[PermissionID]
           ,[RoleID]
           ,[AllowAccess])
     VALUES
           (1
           ,5
           ,0
           ,1)

INSERT INTO [FolderPermission]
           ([FolderID]
           ,[PermissionID]
           ,[RoleID]
           ,[AllowAccess])
     VALUES
           (1
           ,6
           ,0
           ,1)

---EndScript---