As I pointed out in a ticket somewhere, the rewrite for /show/edit/conditions.html needs editing. Instead, a new redirect has been added after the existing broken one.

See lines 207 and 247 of http://git.musicbrainz.org/gitweb/?p=musicbrainz-server.git;a=blob;f=admin/nginx/mbserver-rewrites.conf;h=71087e91220d74e0459b8a6c046846069e744121;hb=c89db9365f864b68fccd1dc5dd6e4d4f855d8e64