For the last week or so when I go to the gmap page (http://[local IP]/dump1090/gmap.html) all I see is the basic info/titles on the right, and a big blank page. I have tried different browsers, different computers and mobile devices, I tried a reboot of the Pi, and still nothing. What could I be doing wrong?

UTC Last Update
[ Reset Map ]

(no aircraft selected)

Aircraft (total): n/a Messages: n/a/sec
(with positions): n/a History: n/a positions
ICAO Flight Squawk Altitude Speed Distance Track Msgs Age