Ok....
This worked. I have no idea why or what I have broken in the process.
But here it is.

Do you have any idea what it could have been?


FIX:
Delete registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FolderTypes\{ef87b4cb-f2ce-4785-8658-4ca6c63e38c6}\TopViews\{00000000-0000-0000-0000-000000000000}