Redmine

Hi I have strange problem. The same problem I have got on 1.0.1 and 1.0.2
Any no image-type attachment works fine but if I want do show image attachment (png jpg gif)
I`am logout. I put some loggers ,it looks something like this:

Processing AttachmentsController#show (for 62.233.211.190 at 2010-10-02 17:48:09) [GET]
  Parameters: {"action"=>"show", "id"=>"24", "filename"=>"xxx.xls", "controller"=>"attachments"}

//logger
// user_setup action => current_user
#<User id: 5, login: "xxx", hashed_password: "36f184ea4b8939c49da1791b03a006d9acbe512e", firstname: "xxx", lastname: "xxx", mail: "xx@xx.xx", mail_notification: false, admin: true, status: 1, last_login_on: "2010-10-02 17:46:56", language: "en", auth_source_id: nil, created_on: "2008-08-24 15:15:46", updated_on: "2010-10-02 17:46:56", type: "User", identity_url: nil>
//attachment model method => visible?
true

and second one for image
before I click on the image link the session[:user_id] is set and is good.

Processing AttachmentsController#show (for 62.233.211.190 at 2010-10-02 17:52:12) [GET]
  Parameters: {"action"=>"show", "id"=>"56", "filename"=>"xxx.png", "controller"=>"attachments"}

//logger
// user_setup action => current_user
#<AnonymousUser id: 2, login: "", hashed_password: "", firstname: "", lastname: "Anonymous", mail: "", mail_notification: false, admin: false, status: 0, last_login_on: nil, language: "", auth_source_id: nil, created_on: "2008-08-07 20:33:19", updated_on: "2008-08-07 20:33:19", type: "AnonymousUser", identity_url: nil>

Redirected to http://redmine.xxx.org/login?back_url=http%3A%2F%2Fredmine.xxx.org%2Fattachments%2F56%2Fxxx.png
Filter chain halted as [:check_if_login_required] rendered_or_redirected.
Completed in 30ms (DB: 16) | 302 Found [http://redmine.xxx.org/attachments/56/xxx.png]