Can't open these tabs in my Browser I'm working with my college on a drupal website. However, we're both logged in as Admin, but I can't open these tabs.

He says he has no problem with it and told me it could be a Java problem. I reinstalled Java and checked in mutiple browsers, but I still can't open them. Do you guys have any clue why?
I run on windows 8.1, I have the latest Java and Flash installed.
Thanks in advance.
As Clive pointed out,


  You have javascript errors, the most common cause of that in the admin
  theme is using the jQuery Update module with its default settings. If
  you do have that module installed, just go to its config page, and
  select the default Drupal jQuery for the admin theme


The Jquery Update Module cause the problem. I configured the module and set my Jquery version to 1.10. This solved my problem