Hmm these things are sent to try us. Lucky for me I can't even replicate what's happening to you, even if I zoom all the way in, no grey blankness. It's actually working rather well for me, amazing. (sorry!)

And you can ignore my comment about pressing alt and whathaveyou. Either they've sorted that bit out or that's how it works on the scottish maps, not Coflein. I'm losing the plot.