Edit: Fixed. I had an error in my permlink structure.
I have a problem with individual posts not showing with their URL.
I have set a custom category base in Permlinks called 'story'. I have a blogpost category called 'chapters', which has a subcategory 'chapter-1'.
Both category pages show fine, but when I want to go to the post (I have to, because I'm using the read more link) I get a 404 error, it can not find the post.
The post does show on the category pages, but the actual link, which wordpress creates as: site.com/story/chapters/chapter-1/post-name/ doesn't work. It looks good to me, that's how I want the URL structure to be.
What can I be doing wrong?