I tried rake redmine:load_default_data RAILS_ENV=production but nothing happened, and messages showed after Ctrl+C.
It seems to be a buffering problem.

% rake redmine:load_default_data RAILS_ENV=production
(in /home/kazu/rails_apps/redmine-0.8.2)

^Crake aborted!


(See full trace by running task with --trace)
Select language: bg, ca, cs, da, de, en, es, fi, fr, he, hu, it, ja, ko, lt, nl, no, pl, pt, pt-br, ro, ru, sk, sr, sv, th, tr, uk, vn, zh, zh-tw [en] 
% ruby script/about
About your application's environment
Ruby version              1.8.6 (i686-linux)
RubyGems version          1.3.1
Rails version             2.1.2
Active Record version     2.1.2
Action Pack version       2.1.2
Active Resource version   2.1.2
Action Mailer version     2.1.2
Active Support version    2.1.2
Edge Rails revision       unknown
Application root          /home/kazu/rails_apps/redmine-0.8.2
Environment               development
Database adapter          mysql
%