NETGEAR Nighthawk Smart Wi-Fi Router, R6700 - AC1750

Above is what I have (I think, because I bought a slightly different model 2 years later for a different house).  Anyway, my problem is that I can't see anything on the screen after successfully logging into the router REMOTELY (using TeamViewer if that's important).  I've tried using Http://www.routerlogin.net as well as the naked address derived from ipconfig.  Both methods present the expected logon username & password prompts; both reject any misspellings; both seem to "accept" correct entries ... but all I get is a blank white screen instead of the expected interface.  Initially, I thought it might be just a display issue caused perhaps by TeamViewer, but I had my wife, who was physically at the computer I connected remotely to, and she confirmed that the screen was indeed blank except for the address bar and usual browser tabs.  I also thought it might be a Google Chrome issue but got the same blank screen using Microsoft Edge.  

Does anybody have a clue what's going on?