Can't open HP printer web page

I have a HP color laser jet Pro M454dw printer, and can't get the printer web page to open properly - all I get is a title and a blank page. I've tried accessing it from the printer preferences page and directly with an IP address, with the same non-result. I've just upgraded to Sequoia, but the same problem was there on previous OS's. The printer is connected by wifi.

The printer prints just fine.

Any thoughts on what the problem might be, and how can I get this page to give me some data?