Links in second language not working when logged out
After much searching, I have code in the site's theme folder, within template.php, that made a call to the drupal_goto function if the connected user was not logged in, for all page requests where the language is set to french.

A search for $base_url led me to find this. Although now seeing that the redirection function in drupal is drupal_goto, I could have found this a lot quicker with a search for that call.