We have a custom post type called Directory Listing. This page displays them to users: hidden link
When users click on a listing, they are getting a 404 error. For example, hidden link
I found that when I disable the YITH plugin, the error resolves. I contacted YITH support and they could not replicate the error being solved by removing their plugin. They spoke to Toolset support who asked that I open a new ticket with this information.
I'm currently having a look at this one for you. I may need to take a copy of the site for further testing so you should see me installing the duplicator plugin.
In my testing it would appear to be an issue with the directoy-listing slug conflicting with the YITH plugin. Not sure if the YITH plugin is setting this slug somewhere but i found that changing the slug even so slightly will resolve the issue.
In my test site I change the slug to directory-listings .