Guys, I also have this issue right after upgrade from 0.8.3 to 0.9.4.stable.3733 (MySQL)
I am using apache2+passenger and had removed my /public/.htaccess since redmine was not working after the upgrade.
Everything else is working fine for all other projects. Even this same page works for other projects. The issue only affects /projects/wiki/settings when I try to click the 'save' button under 'information' tab (screenshot attached)
After click the button I got redirected into /projects/edit/wiki with the following text:
404
The page you were trying to access doesn't exist or has been removed.
/log/production.log shows this:
Processing WikisController#edit (for 192.168.1.201 at 2010-05-05 22:29:33) [POST]
Parameters: {"commit"=>"Save", "project"=>{"name"=>"wiki", "tracker_ids"=>[""], "description"=>"General Wiki for WWDS", "homepage"=>"https://redmine.wreal.tv/wiki/wiki", "is_public"=>"0", "parent_id"=>""}, "action"=>"edit", "authenticity_token"=>"1EfCKDJqfhUKTQCO+Gh0mlKDbRg6mSxf1poF4rjvOBw=", "id"=>"edit", "controller"=>"wikis"}
Rendering template within layouts/base
Rendering common/404 (404)
Filter chain halted as [:find_project] rendered_or_redirected.
Completed in 14ms (View: 10, DB: 0) | 404 Not Found [http://192.168.1.51/projects/edit/wiki]
Any idea?