https://staging4.allanwaterpottery.com/
On this site there are several CPTs, all created with Meta Box.
However, going to the Post Types shows no results "Not found".

As you can see from this image, there are MB Post Types on the site.

I've cleared the cache, saved the Permalinks, disabled and re-activated all other plugins.
All my other sites seem to be working fine.
Any ideas?
Thanks
Alistair