Written on July 16, 2008 by CincauHangus
WordPress 2.6 for some has been an upgrade nightmare. For me, I had no problems. But if you do experience problems with your permalinks, or experiencing 404 errors (this page does not exist) you can try the following steps as provided by WordPress Support.
1. If you’re using Linux/Apache on your webserver, you don’t really need the index.php anyway. Try removing it. The index.php thing was only meant for IIS servers, which don’t support mod_rewrite.
2. If you need/want the index.php to be there, then on the Settings->Permalinks screen, add some values in for the category and tag bases. The words “category” and “tag” will do just fine. As long as they are not blank, this should work around the bug.
The easiest would be to try #2 but still it’s your choice. The next version of WordPress (2.6.1?) shall fix these problems. Source.
Filed in: WordPress.