I have the same problem! I am using an Dlink 860L Router since about 6 months without any problems! But today I tried to login to the webinterface of the Router and all I see is a blank page, despite my browser (Chrome) showing me the background texture, but without any text or the username password query!!!
I already tried other browsers (Edge, IE and Firefox) and everywhere I have the same problem.
No errors or other popups, just a blank page.
With Chrome on my tablet I do get to the mobile version, but even there if I afterwards click the "View: Desktop" link, I get a blank page, but this time with the "Home, Settings, Advanced, Management" riders on top, but also no matter what I do the rest of the page is blank!
I don't know what to do...