Thanks for coming back to me so quickly. After turning off image resizer the media folder gallery still doesn't work, but the November Gallery does, so happy days!
I still have image resizer installed, I didn't realize this feature had been migrated to the core. I'll check out the docs to see what the filter syntax looks like.
Thanks again Laszlo.
P.s The Tongariro Crossing sure is amazing, I have hiked it many times. I'm glad you have had the chance to experience one of New Zealand's magical destinations..