The problem we are describing here is this, if you click on your domain with the category as the suffix it redirects you to your 404 page. For example our blog page would be:
It should show the list of posts which are assigned to the Blog category.
We have read several ‘fixes’ that did fix the problem, for us this works and is very easy to do.
Basically WordPress has got it’s self in a muddle with the permalinks so you simply need to reset it, follow these instructions:
In your WordPress Dashboard:
You are probably not using the Default option here, so:
Select the Permalink you like, we use POST NAME.
This should now fix the problem, simple!