Hello Ross,
Thanks for getting in touch and I’m truly sorry for this issue. Let’s try to solve that.
I have checked your site and while I got a 404 error on the month and the list view, the photo view seemed to work fine.
Based on your settings it also looks like that only the photo view is enabled, however, the list view is set as the default, but that is not enabled.
Try either setting the default view to photo, or enable the list view as well. Or any combination where these 2 options have a match. 🙂
Let me know if that helps!
Cheers,
Andras