I upgraded WordPress SEO by Yoast to version 1.2.5 and from this categories and tags are not working ...
I tried to stop all plugins and enable it again, tried to remove it, I tried to install it again and still nothing's working!
My WordPress version is 3.4.1 and even though the plugin is disabled when someone clicks on a link tag is redirected to a post using that tag, and when someone clicks on any category is a 404 ... Author Archive continues to function without problem.
What should I do to solve this! Even removing the plugin solves the problem!