This error is quite simple. When you have upgraded wordpress, the files have not been downloaded correctly. If you login via ftp you will see that some of the files have a size of zero bytes. To fix this error, you should upload the latest wordpress files to your blog, overwriting existing files. Now, login [...]
Before upgrading your WordPress version, you should absolutely read the following article: WordPress: To upgrade or not to upgrade, that is the question This guide helps you make a well founded decision whether to upgrade your WordPress version or not and will help prevent issues, errors and conflicts with your website, plugins or themes.
Firefox has detected that the server is redirecting the request for this address in a way that will never complete
This error can happen in one of two places within WordPress, on the user side, or on the admin side. When it happens on the admin side (wp-admin), you will find that you are unable to login. and firefox will show you the following error message: “Firefox has detected that the server is redirecting the [...]