The user role provided was not an admin user. I need to have admin access in order to check on the permalink settings, however I suspect the problem is caused by the Custom Permalinks plugin.
I will also need to investigate further. We don't recommend modifying the permalinks beyond what is provided by the wordpress default because custom permalink rewrite rules can be tricky to handle.
Hi Shane, I deactivated the custom permalink. It was not being used. It didn't solve the problem, unfortunately. I gave you admin access. Please let me know once you find the issue.