I'm confused...
If I appy this fix then I have a "last upload" for the Members Category that I uploaded using another account with no corresponding member being shown in the category listing. Without this fix in place I get the Unregistered even though it was a registered user.
EDIT: After deleting the pictures located in the "dynamic" sub-categories I now have 1 too few sub-cats showing in the category listing. It's there and can be accessed via the category number. It just doesn't display.