I am having trouble applying the clean permalink structure to my uploads/attachements in a consistent way.
One some occasions, I notice that the attachment gets the clean URL,
http://mydomain.com/2008/06/post/attachment/
and on other occasions, it adopts the basic, http://mydomain.com/?attachment_id=533
My current permalink structure is Month and name based:
/%year%/%monthnum%/%postname%/
Any clarity on when and why this occurs would be much help.