Redmine

Installed on Dreamhost (shared hosting, mySQL, ...) version 1.2.2, then also upgraded to 1.3.0 - in both the following happens:

• when a ticket is created, the form redirects to the ticket page but shows Page not found 'The page you were trying to access doesn't exist or has been removed.'
• when a ticket is updated, it also redirects to the ticket page, again failing with the 'Page not found'
• in BOTH cases, the create/update succeeded, just the redirect behaves weird

Opening the ticket directly works just fine, even refreshing the 'Page not found' page.
The about info:
About your application's environment
Ruby version 1.8.7 (x86_64-linux)
RubyGems version 1.3.7
Rack version 1.1.1
Rails version 2.3.14
Active Record version 2.3.14
Active Resource version 2.3.14
Action Mailer version 2.3.14
Active Support version 2.3.14
Application root /home/redadmine/r.pragment.com
Environment production
Database adapter mysql
Database schema version 20110902000000