Hi. i seem to have the same problem. I have been using the joomsef component on my site http://www.borderterriers.se without problems. But since i upgraded the site from joomla 1.012 to joomla 1.015 i cannot acess my administrator backend. i get a .404 errormessage from joomsef. when i type in the url: borderterriers.se/administrator/ i get redirected to borderterriers/administrator/installation/ and get the errormessage. Any solutions?