When I use /%postname%/ in permalinks, if you click on category in the post you get a 404 page not found error. If I remove /%postname%/ then the category page is found. How can I fix this so I can use a permalink AND have the category page be found?
I tried changing the permalink to /%post_id%/%postname%/ but when I click on category I still get a 404 error.
Can anyone help or is problem unfixable?