I use Firefox and Chrome to look at the NZLWN site and suddenly last week the map and Station data pages appeared blank.
I was thinking it was a problem with the site, but it seems that those pages only respond to http: requests and not https:

After taking the "s" off, the pages loaded.  I only had to do this once and the browsers kept that requirement in memory so they've load without any problem since.
Hopes this may help anyone with the same problem.

TonyC