Redmine

Dear all,

I have a fresh installation of Redmine,

Redmine 1.2.2.stable (MySQL)
Default administrator account changed    (ok)
Attachments directory writable     (ok)
Plugin assets directory writable (ok)
RMagick available (optional) (no)

and am trying to access the URL https://mydomain.com/issues (I am pointed to this URL by the "View all issues" link on the Projects page). This results in a "You are not authorized to access this page." error message and the following in the log file:

Processing IssuesController#index (for MyPI at 2011-12-18 12:06:27) [GET]
  Parameters: {"action"=>"index", "controller"=>"issues"}
Rendering template within layouts/base
Rendering common/error (403)
Filter chain halted as [:authorize] rendered_or_redirected.
Completed in 76ms (View: 74, DB: 0) | 403 Forbidden [https://mydomain.com/issues]

I am logged in as administrator.

Does anybody have any idea what the problem might be?

Thanks,
Kaspar