You have just completed the installation and configuration of your new WordPress blog–by the book. You proudly log into the dashboard and select a customized permalink (I use /%postname%/) and then hit the “Save Changes” button to save your configuration. Your blog now–goes crazy. When you try to access your blog, your browser returns nasty error pages instead of your blog’s content.
You recheck everything again, but can’t find any problem with your installation procedure. Using your FTP program or the WebShell utility at your web-host’s control panel, you verify that all of the necessary WordPress files and folders are in place and that the permissions are set correctly.