Little pencil icon to edit blocks not appearing

Hi Everybody,

I recently joined to a new work where they have Drupal for the company portal, I have the admin role but i'm not able to edit the pages using chrome, the little pencil icon is not appearing, same thing with firefox. It only works with IE, but it is slow to work editing the pages.

Any idea how to solve this issue?

Thanks in advance.

Ruben B