I recently downloaded the security fixes from here:
http://wordpress.org/development/2008/04/wordpress-251/
Specifically:
wp-includes/pluggable.php
wp-admin/includes/media.php
wp-admin/media.php
I uploaded these to my blog with an FTP client... and the Wordpress admin dashboard promptly stopped working.
In sheer desperation I replaced the files with the original 2.5 files... nothing seems to help. The blog itself seems to operate fine, but I can't access any of the Wordpress administration settings.
Any help would be greatly appreciated.
I recently started the blog from scratch... and, honestly, if I have to do that again, I may cry. lol