Redmine

Hi,

I've just upgraded to 3.3.3 and I have a very strange side-effect.
The scrollbar is missin on some pages (wiki, issues) etc... it happens only in google chrome. In FF it looks right.
I use a different theme but with the original one is the same issue.

Any ideas? See screenshots.

Environment:
  Redmine version                3.3.3.stable.16584
  Ruby version                   2.2.3-p173 (2015-08-18) [x86_64-li
  Rails version                  4.2.7.1
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.9.3
  Git                            2.7.4
  Filesystem
Redmine plugins:
  redmine_agile                  1.4.3
  redmine_ckeditor               1.1.2
  redmine_impersonate            0.10.0
  redmine_lightbox2              0.3.2
  redmine_per_project_formatting 0.0.3
  wiki_issue_fields              0.5.1