W+ can't download file, goes to login.php instead

[ttcoder]

1.3.1 in 47209

Downloads work fine in public sites... But when there is a (cookie based) login wall, file download fails to work in both cases I tested: webmail.free.fr and keepandshare.com (that latter one allows free sign up I think).

For instance say I'm reading my webmail, and one email has an attachement, which I click : instead of getting the file, webpositive instead downloads a login.php file (of MIME type application/xhtml+xml if that matters). It seems the authentication cookie is not propagated in that case. Other use-cases work (e.g. clicking on the "next page" in webmail works, I'm not redirected to the login page).