runserver doesn't allow logins

Command output with debug and watchdog enabled.

drush rs -d --watchdog --user=1 /admin
Bootstrap to phase 0. [0 sec, 4.93 MB]                               [bootstrap]
Drush bootstrap phase : _drush_bootstrap_drush() [0.01 sec, 5.22 MB] [bootstrap]
Cache HIT cid: 5.0-dev-commandfiles-0-49f037411f591b4cb6201b7fac000788 [0.01 sec, 5.24 MB] [debug]
Bootstrap to phase 0. [0.05 sec, 11.27 MB] [bootstrap]
Bootstrap to phase 5. [0.07 sec, 11.28 MB] [bootstrap]
Drush bootstrap phase : _drush_bootstrap_drupal_root() [0.07 sec, 11.28 MB] [bootstrap]
Initialized Drupal 7.16 root directory at /home/pcampbell/Projects/svn/site-lb-back/htdocs/future [0.09 sec, 15.35 MB] [notice]
Drush bootstrap phase : _drush_bootstrap_drupal_site() [0.1 sec, 15.36 MB] [bootstrap]
Initialized Drupal site default at sites/default [0.1 sec, 15.36 MB] [notice]
Cache HIT cid: 5.0-dev-commandfiles-2-c32acd775c18a90c5b41d0fc9accf5ab [0.1 sec, 15.37 MB] [debug]
Drush bootstrap phase : _drush_bootstrap_drupal_configuration() [0.1 sec, 15.36 MB] [bootstrap]
Drush bootstrap phase : _drush_bootstrap_drupal_database() [0.11 sec, 15.38 MB] [bootstrap]
Successfully connected to the Drupal database. [0.11 sec, 15.39 MB] [bootstrap]
Drush bootstrap phase : _drush_bootstrap_drupal_full() [0.12 sec, 16.36 MB] [bootstrap]
Cache HIT cid: 5.0-dev-commandfiles-5-aa08349babfc3fe25a7ddd21a34fe443 [0.32 sec, 47.29 MB] [debug]
Found command: runserver (commandfile=runserver) [0.33 sec, 48.13 MB] [bootstrap]
Executing: which php-cgi
  /usr/bin/php-cgi
Drush bootstrap phase : _drush_bootstrap_drupal_login() [0.41 sec, 48.61 MB] [bootstrap]
Successfully logged into Drupal as root (uid=1) [0.42 sec, 49.33 MB] [bootstrap]
HTTP server listening on 127.0.0.1, port 8888 (see http://127.0.0.1:8888/admin?login), serving site default, logged in as root...
Executing: which xdg-open
  /usr/bin/xdg-open
Opening browser at http://127.0.0.1:8888/admin?login [0.43 sec, 49.79 MB] [notice]
Created new window in existing browser session.
Watchdog: admin | severity: 4 | type: access denied | uid: 0 | 127.0.0.1 | http://127.0.0.1:8888/admin?login |  |
127.0.0.1 - - [16:51:19] "GET /admin?login HTTP/1.1" 403 2895
HTTPRequest Object
(   
    [method] => GET
    [request_uri] => /admin?login
    [uri] => /admin
    [http_version] => HTTP/1.1
    [query_string] => login
    [headers] => Array
        (   
            [Host] => 127.0.0.1:8888
            [Connection] => keep-alive
            [User-Agent] => Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.94 Safari/537.4
            [Accept] => text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
            [Accept-Encoding] => gzip,deflate,sdch
            [Accept-Language] => en-GB,en;q=0.8
            [Accept-Charset] => ISO-8859-1,utf-8;q=0.7,*;q=0.3
            [Cookie] => has_js=1
        )

    [lc_headers] => Array
        (   
            [host] => 127.0.0.1:8888
            [connection] => keep-alive
            [user-agent] => Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.94 Safari/537.4
            [accept] => text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
            [accept-encoding] => gzip,deflate,sdch
            [accept-language] => en-GB,en;q=0.8
            [accept-charset] => ISO-8859-1,utf-8;q=0.7,*;q=0.3
            [cookie] => has_js=1
        )

    [content_stream] => Resource id #185
    [remote_addr] => 127.0.0.1
    [request_line] => GET /admin?login HTTP/1.1
    [start_time] => 1351615879.2458
    [cur_state:HTTPRequest:private] => 2
    [header_buf:HTTPRequest:private] =>
    [content_len:HTTPRequest:private] => 0
    [content_len_read:HTTPRequest:private] => 0
    [is_chunked:HTTPRequest:private] =>
    [chunk_state:HTTPRequest:private] => 0
    [chunk_len_remaining:HTTPRequest:private] => 0
    [chunk_trailer_remaining:HTTPRequest:private] => 0
    [chunk_header_buf:HTTPRequest:private] =>
    [socket] => Resource id #184
    [response] => HTTPResponse Object
        (   
            [status] => 403
            [status_msg] => Forbidden
            [headers] => Array
                (   
                    [X-Powered-By] => PHP/5.3.3-7+squeeze14
                    [X-Drupal-Cache] => MISS
                    [Etag] => "1351615879-1"
                    [Content-Type] => text/html; charset=utf-8
                    [Content-Language] => en
                    [X-Generator] => Drupal 7 (http://drupal.org)
                    [Cache-Control] => public, max-age=0
                    [Last-Modified] => Tue, 30 Oct 2012 16:51:19 +0000
                    [Expires] => Sun, 19 Nov 1978 05:00:00 GMT
                    [Vary] => Accept-Encoding
                    [Content-Encoding] => gzip
                    [Server] => Drush runserver
                )

            [content] =>
            [stream] => Resource id #203
            [prepend_headers] =>
            [buffer] =>
            [bytes_written] => 2895
        )

)