When I set the permalinks to defaults settings the site works fine without any 404's. Its when I then change it to date and name based (or any other permalink settings) that it brings the 404 pages on my whole blog except for the homepage.
I thought then maybe it the .htaccess file that hasnt been updated but it has. When I press update settings on the permalinks menu it says "Permalink structure updated."
So why isnt it allowing me to change the permalinks structure?