Iain, has your computer just had an upgrade to Microsoft Edge?
Mine did the auto update, then, when I clicked on the 'Vessel' or 'Port' box on Marine Traffic, nothing happened. Until I entered the name of the first ship I was looking for. They had all been wiped out by the upgrade!
That Gates fella really peeves me off - he sits at home and buggers up our computers all around the world, just because some 'smart' young underling decides it is time to confuse all us 'senior citizens' again.
I'm currently using an iPad on which it worked before, but not for the last few months. It has not been upgraded. I also have an iMac desktop computer so will try it on there and see what happens. I don't like Windows ( to switch off, press the 'start' button!) and have always used Macs.
All I get is a blue line with the title and nothing else.