There are some rules that have to be written in order to enable apache to make the url rewriting (which basically means, the normal url is [login to view URL] but apache change it so that you see in the adress bar: user_rodrigo_munoz_something
It was working before but now it is causing the jobs links to generate 404 pages instead of the actual job link. click on the link of the first job on this page to see [login to view URL]