Dashboard Not Showing On Some Computers

i`m recently updated my office`s jira to 6.1.2
unfortunately on some computers at the office, jira doshboard doesn`t show with any of browsers.
and other function`s like project roles not visible either! in not depends on permissions because i have dashboard on my system but when i logged in (with my own account) to another computer that have problem i can`t see my dashboard! here some pictures for that problem.
please help me to resolve that issue because i have over 80 computers at the office but 50 of them doesn`t have jira dashboard!