Unable to display Fortimanager login page on IE 11

Hi,

I facing an issue to login my Fortimanager using Internet Explorer 11. After I clicked on "Continue to this website(Not recommended" on the security warning page(because it's https), I got a blank page as attached (usually will display username and password to login)

Fortimanager info:

Model: Fortimanager 200D

Version: v5.2.6-build0753 160317 (GA)

I tried on IE 7 and Chrome browser no issue.

Appreciate if anyone can advise if this can be fixed by upgrade the Fortimanager firmware version. If so, which version should i upgrade to.

Thanks in advance.

Nick