Can I send you a link privately?
All plugins disabled, and Permalinks set to /%postname%/, but still the same issue
That’s what I had it set to before, and unfortunately causes the problem
I should also note that if I switch Permalinks off, to the default ?p=123 then everything works fine (although obviously other pages I link to are expecting Permalink URLs).
I’ve also just found out that the Numeric option works, so it looks like any Permalink that uses %postname%/
