After upgrading from Lion to Mountain Lion a lot of my webdav folder authorizations disappeared. Some folders are still accesable and some not. Besides the migration nothing has been changed to the server (mac mini mid 2011). When I look in the server administrator all authorizations are okay.
I hope that somebody can help me with this problem.
Problem is solved. Solution is to remove '/webdav' at the end of the server url in the client. After removing I saw the complete list of folders again.