It turns out there was an issue with the GPX track file downloads after shifting to the new web hosting company, thanks to Dave Caesar for bringing this to my attention. This has now been fixed.
The full island maps on the North Island tracks and South Island tracks pages are not displaying properly. I’m working on getting these sorted but in the meantime use the links on the right hand side of these pages to view the maps. The local maps on the track pages are working fine.