I have a page where I added a view to creating an archive view for "members". I have added a custom field filter and a taxonomy filter however after I added the taxonomy filter I get a zero results screen. I tried to delete the filter but it does not delete it. It stays on the view.
I have no problem granting access should you need to have a look.
You are welcome and it will be highly appreciated. All we ask is that you put the site under maintenance (admin bar top) while you are busy and obviously do not disable the maintenance plugin also. A further error I encountered when I tried to create a new "new-find editors page" did the same and then it breaks the site with a 503 error. If you view the page it will give the error. I was using the exact same method on the new one just without the filters and it is breaking the site.
I found the issue and the view should be working fine now. IT turns out that you had a sorting for the last name on the view, however it was using the wrong custom field for the surname, see the debug below.