Redmine

When accessing the history version of a Wiki page (e.g. Wiki?version=16), just a string which is not human readable is displayed. It starts like this and is about 5000 characters long:

\x68312e204d532050726f63657373696e6720506970656c696e670d0a0d0a68322e2047656e6572616c2073657475700d0a0d0a57696e646f7773206d616368696e657320617474616368656420746f206d61737370656320617265207573656420746f20636f70792066696c657320746f206365727461696e206c6f636174696f6e732e20402f72

Same result for exporting TXT or HTML of the current version, and a Wiki-diff just diffs between two such strings.

There's no error/warning message in the log

Thanks for your help and Redmine!

Versions:
Redmine 1.1.0
Ruby 1.8.6
Rails 2.3.5
Rack 1.0.1
Postgres 9.0.2, migrated from Redmine 1.0

Log msg:

Processing WikiController#show (for 193.171.186.112 at 2011-02-21 16:55:35) [GET]
  Parameters: {"project_id"=>"mspipeline", "action"=>"show", "id"=>"Wiki", "version"=>"4", "controller"=>"wiki"}
Rendering template within layouts/base
Rendering wiki/show
Completed in 570ms (View: 525, DB: 31) | 200 OK [http://head1/redmine/projects/mspipeline/wiki/Wiki?version=4]