Redmine

The JS condition that's supposed to hide the tab buttons checks if the first LI element is visible or not.
If there is no LI element, the tab buttons are always shown.

file: public/javascripts/application.js
line: 383

replace:

if ((tabsWidth < el.width() - bw) && (lis.first().is(':visible'))) {

by:

if ((tabsWidth < el.width() - bw) && (lis.length === 0 || lis.first().is(':visible'))) {

In case it helps, here is my environemt:

Environment:
  Redmine version                3.3.0.stable
  Ruby version                   2.1.5-p273 (2014-11-13) [x86_64-linux-gnu]
  Rails version                  4.2.6
  Environment                    production
  Database adapter               Mysql2
SCM:
  Git                            2.1.4
  Filesystem                     
Redmine plugins:
  redmine_agile                  1.4.1
  redmine_backlogs               v1.0.6
  redmine_checklists             3.1.3

Sorry not provinding a patch but I'm a Git guy so I don't have anything related to SVN installed on my system.