Tabs on router configuration page do not show

I have a d-link router, and the tabs and some of the buttons on the configuration page do not show.

I am normally using firefox and found that if I opened the conf. page in IE it would show correctly. But now something happened and it won’t show in either browser.

What causes this and what can I do to fix it?

If it’s a really old router, it could be delivering the configuration pages in some non-standard way that worked fine with older browsers, but maybe some recent upgrade to your system doesn’t support it.

Have you tried switching to ‘compatibility view’ in the browser?

Alternatively, it might be relying on something like Javascript, which might be turned off in your browser configuration.