Can't view pages since update

Hi,

I thought this problem was down to the theme I was using but I’ve tried changing it to various ones (ones I use on other sites with no issue) and the problem persists.

Basically I can view pages without parent pages, but those with one I can’t.

So, https://discography.mmmboptastic.com/fanclub-membership-kits/ works fine but if I try to view any other pages such as https://discography.mmmboptastic.com/albums/anthem/ it comes up with the ‘albums’ page and won’t let you view the ‘Anthem’ page. Even if you click on the link to a page or ‘view page’ from there it won’t work.

Any ideas what’s causing this? It has only been happening since the most recent update to 3.8.

Thanks,

Jo