Redmine

Nope, JS is enabled. Checked with Chrome and Safari

Do you use plugins?

no. rechecked. no plugins.

Environment:
Redmine version 3.0.2.stable
Ruby version 2.1.5-p273 (2014-11-13) [x86_64-linux]
Rails version 4.2.1
Environment production
Database adapter PostgreSQL
SCM:
Subversion 1.6.17
Git 2.1.4
Filesystem
Redmine plugins:
no plugin installed

Sorry, we have found the reason, our admin has mistaken document root :( strangely, everything else seemed to work! My apologies and thanks for assistance!