Mail has been sent to Stephen.

Note that I just discovered that the situation is 
now marginally better than it was 3 - 4 weeks 
ago, when I last tried.  Now, if I completely 
disable my software firewall, I can see the 
images.  This is definitely an improvement, but I 
asked Stephen whether there's something going on 
at the Museum end that I can coach my software 
firewall about, so that I don't have to disable 
it.