Redmine

1. New issue, leave the tracker as default.
2. Look at the start date/due date fields, there is a date picker icon (looks like calendar).
3. Switch to another tracker.
4. Look at the start date/due date fields, the icons are gone.

Environment:
Redmine version 2.3.3.stable.12220
Ruby version 1.8.7-p249 (2010-01-10) [i486-linux]
Rails version 3.2.13
Environment production
Database adapter PostgreSQL
Redmine plugins:
redmine_code_review 0.6.3
redmine_custom_workflows 0.0.4
redmine_default_version 0.0.2
redmine_didyoumean 1.2.0
redmine_issue_detailed_tabs_time 0.1.0
redmine_issue_extensions 0.2.0
redmine_lightbox 0.0.1
redmine_wiki_extensions 0.6.4
redmine_wiki_lists 0.0.3
wiking 0.0.2