I have just updated to 3.4.1 and now my categories no longer work. When I click on any category it presents a 404 page listing all my posts.
In the admin panel they are all there and nothing has changed. When I click on "View" in the category in the admin panel it shows the category perfectly as it should be, but not anywhere else. My static pages still work perfectly, it is only the categories that seem affected.
If someone is able to shed some light on this for me I would be grateful. Please bear in mind that I am a newbie at this, so please try and explain this to me as simple as possible. Many thanks for any help in advance.